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What does base curve mean for contact lenses



Is there a big difference between 8.4 and 8.6 base curve?

Studies show that a single base curve of 8.4mm managed a “good or better” fit in approximately 90% of individuals,1 and base curves of 8.4mm and 8.6mm together encompassed 98% of individuals.

48.4, 8.613.8
68.5, 9.014.2

Sep 1, 2017

How do I choose the right base curve for contacts?

Base Curve Many lens fabricators suggest starting with a base curve radius (BCR) that is 4.00D to 5.00D flatter than flat K. Another method is to trial-and-error fit by selecting the middle BCR available. Most soft lens designs feature three BCRs: Steep, median and flat.

How does base curve affect contact lenses?

A base curve that is too big will cause the contact lens to not sit properly on the cornea. While less medically dangerous than wearing an overly-small base curve, it can still cause annoyance from the contact lens shifting around or poor vision.

What’s the difference between 8.4 and 8.8 base curve?

A BC of 8.4 mm of radius is more curved, and therefore a tighter fit, than 8.8 mm base curve. People who have steeper corneas require tighter fitting contacts. If a contact is too loose, it may be uncomfortable, fold, or come right out.

What is the most common base curve for contacts?

between 8.0 and 10.0 mm

Typical base curve values range between 8.0 and 10.0 mm, though it can be flatter (from 7.0mm) if you have a rigid gas-permeable lens. A person with a higher base curve number has a flatter cornea (the clear, front surface of the eye) compared to someone with a lower base curve number, which indicates a steeper cornea.

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How do I know my base curve?

Simple Rule for estimating lens base curve on a PLUS POWER lens

  1. For plus power use the spherical equivalent (SE) and add 4.00 diopters to that. For example, if you have an Rx of + 2.00 sphere, the base curve for the lens will be approximately 6.00.
  2. Rx +2.00Sph -> [+2.00 +4.00D] = 6.00BC.

How do I know if my base curve is too big?

If you realize that you’ve gotten contact lenses with an incorrect base curve, you may feel it. Lenses with the wrong base curve feel like they won’t settle right on your eyes. If the lens is too curved for example, it may just slide around in your eye. Every time you blink, it may shift its position.

What is the average base curve?

Typical base curve values range between 8.0 and 10.0 mm, though it can be flatter (from 7.0mm) if you have a rigid gas-permeable lens. A person with a higher base curve number has a flatter cornea (the clear, front surface of the eye) compared to someone with a lower base curve number, which indicates a steeper cornea.

Does base curve of contacts matter?

Yes they do matter. The BC, or base curve, is measured based on your cornea’s curvature. If the base curve is too small, it’ll squeeze your eye, and if it is too big, it won’t stay on your cornea. These both may cause damage to your eye.

How do I figure out my contact lens base curve?

Base curve = 0.95 * 34.82 D = 33.07 D and then round up or down to the nearest whole diopter to arrive at the following final base curve to use for a contact lens over-refraction: Base curve = 33.00 D (actual measured base curve is 32.95 D)

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What is the difference between 14.0 and 14.2 diameter contacts?

14.0mm and 14.2mm contacts

In fact, there is not much difference between these two. Some manufacturers only make 14.2mm diameter contacts, and some others produce 14.0mm diameter contacts. … In other words, the predominant size for the small contacts is between 14.0mm to 14.2mm.

How do you tell if your contacts are not the right size?

Place the contact lens between the tips of your thumb and forefinger, grasping it near the center so the entire edge is free. Gently squeeze the lens, as if you are about to fold it in half. If the edge of the lens points upward (resembling a hard-shell taco), the lens is correctly oriented.

How do I know if my contact lenses are too strong?

1) Blurred Vision

Stare straight ahead with the other eye. Is your vision hazy or blurred? Repeat with the other eye. A cloudy or blurred vision in one eye, while the other is closed is a sure sign that the power of your glasses or lenses is incorrect.

How do I know my eye diameter?

For accuracy and consistency, always measure from the white part of one side of the eye directly across to the white part of the other side of the eye. Reference the example image below; the corneal diameter or visible iris diameter measures 12.01mm.

Is a bigger lens diameter better?

From a pure optics perspective, lens diameter is crucial. Larger diameter accounts for larger light “intake”, and with more light ending up on the sensor, you can make the same image quality with shorter exposure.

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What is base curve and diameter on contact lenses?

Contact Lens Base Curves and Diameters

Find the base curve (the curve of the back surface of the contact lens e.g. 8.4, 8.5, 9.0) and diameter (the diameter of the contact lens which is a number between 13.0 to 15.0) of your contact lenses using the list below.

What is normal contact diameter?

The diameter of regular contact lenses that are sold in the United States are on average 14mm–16mm. Similar to the diameter of regular contact lenses, circle lenses have no more than 15mm diameter since larger sizes would be harmful to the eyes at daily wear.

Does your eye base curve change?

Base curve can also change as you wear a contact lens based on environmental factors like the lens drying out, temperature changes, and exposure to makeup or soaps. As a doctor, selecting a contact lens for best fit is also challenging because the sagittal depth of any contact lens is not notated on the packaging.

What is the normal eye diameter?

The size of a human adult eye is approximately 24.2 mm (transverse) × 23.7 mm (sagittal) × 22.0-24.8 mm (axial) with no significant difference between sexes and age groups. In the transverse diameter, the eyeball size may vary from 21 mm to 27 mm.

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Cost of Netflix in Nigeria




When it comes to moving boxes and streaming services, it is difficult to look beyond Netflix. Apart from the fact that they have become more popular in the streaming and movie boxes industries today, they without a doubt, boast finest selections of original and top-class movies. It is easy to see why they rate among the very best at what they offer.

While they have answered lots of questions about their quality and originality, many people still have questions as regards how much their subscriptions go for. In this post, we will take a look at the various types of subscriptions available on Netflix and how much they go for today.

How Much do Netflix’s Plans Cost in Naira?

Like most other streaming services in and outside Nigeria, Netflix subscription comes at standard prices. The streaming service offers three main streaming plans and they vary in prices.

For accuracy, we will leave the price estimates in dollars, as the consistency in the currency exchange rate could result to a not-so-accurate computation. As it stands, the cheapest Netflix subscription goes for $8.99 (approx. N3,300) while the most expensive goes for about $15.99 (approx. N5,850) which approximates to $16 per month.

See below the various streaming plans available today and how much they go for.

Basic Subscription

This is the cheapest and the simplest subscription plan available on Netflix. This plan also has the most limited features and compare to others, the simplest. The plan costs $8.99 (approx. N3,300) which approximate to $9. The basic subscription plan allows the user to access it only on a single screen per time. This plan comes as an advantage to users who are single users to their account and do not share their subscription with any other person.

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Also, the resolution is limited to SD – Standard Resolution. While this might not offer the same viewing experience as the HD, it is still largely appreciable and to a standard, offers a fair view experience. Considering the cost though, users wouldn’t have so much to complain about.

Standard Subscription

Unlike the basic subscription plan, the standard subscription plan allows users to watch on more than one screen. The plan costs an approximate of $13 (approx. N4,750) per month. Another advantage this subscription plan has over the basic plan is that it supports High Definition (HD), which means you can take your viewing experience to another level.

Premium Subscription

This subscription plan is currently the most expensive Netflix subscription plan available today. At the rate of approximate $16 (approx. N5,850) per month, users can watch on up to four screens at the same time. This is perfect for a family and friends setting in which four users can be on the same subscription, watching different movies or programs at the same time. Also, the premium subscription plan supports both HD and 4K Ultra HD views.

Paying for the subscription plan you are picking wouldn’t be a problem at all. Like most other online payments, you can easily subscribe to your preferred Netflix plan with your card, either with your Master Card or with Visa Card. You can also use your PayPal account to make payment for your preferred subscription plan.

Usually, when you register for Netflix, your subscription for the first month is usually free. However, to get this, you will be required to register a d provide your payment details before you are entitled to the free subscription.

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Connecting Netflix to Your TV

While you can watch Netflix movies on many platforms by connecting it to those devices, connecting it to your TV offers the very best experience, especially when you are on standard or premium subscription plan, which will give you access to better HD or 4K Ultra HD viewing experience.

With a Smart TV, you can easily link your Netflix account to the TV. For other types of television, you can easily access your Netflix with your laptop or other similar device and connect your laptop to the television with your HDMI cable.

What You Will Like About Netflix

Easy to use – This perhaps is the most obvious advantage Netflix has. The streaming service is so easy to use. It does not require any complex out of the box setup. All you need do is subscribe for the plan you prefer, login to your account and watch movies on the platform you choose. You can also download the application on your phones, tablets and personal computers.  If you want to watch on your TV, you can easily access your account you’re your smart TVs or connect via HDMI on other types of TV.

No Commercials – One of the most frustrating thing when streaming a show or a movie is the adverts that pop up on a regular basis. On Netflix though, you wouldn’t experience this.

Various Subscription Plans – Another benefit of Netflix is that you can select a membership plan that suits you, as already shown above. You also have the option to either downgrade or upgrade your subscription plan anytime you want. You can also smile with the knowledge that the first month is free for all the plans and you can also decide to cancel a plan whenever you want.

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Great Overall Experience – Do we still need to emphasize this? Netflix offers you an experience you would not forget in a moment. You can watch movies and shows without putting a hole in your pocket. You can also create a list of your favourite movies and explore new content.

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How should a permanent loss in value of an investment using the equity method be treated




How do you account for equity method of investment?

Equity method investments are recorded as assets on the balance sheet at their initial cost and adjusted each reporting period by the investor through the income statement and/or other comprehensive income ( OCI ) in the equity section of the balance sheet.

Can an equity method investment be negative?

It is possible to recognize ‘negative investment’ as liability only to the extent that the investor has incurred obligations due to negative equity of the associate or joint venture. The equity method is applicable not only for ordinary shares but also for other parts of the net investment in the entity.

When should an investor always use the equity method to account for an investment?

An investor should always use the equity method to account for an investment if: It has the ability to exercise significant influence over the operating policies of the investee.

When should a company use the equity method to account for an investment in another company’s common stock?

The equity method of accounting should generally be used when an investment results in a 20% to 50% stake in another company, unless it can be clearly shown that the investment doesn’t result in a significant amount of influence or control.

How do you account for loss on equity method?

When using the equity method, an investor recognizes only its share of the profits and losses of the investee, meaning it records a proportion of the profits based on the percentage of ownership interest. These profits and losses are also reflected in the financial accounts of the investee.

What is an equity loss?

Equity in Net Earnings/Loss represents a reversal of non-cash earnings/losses from investments under the Equity Method. For such investments, undistributed earnings/losses of the investee are included in the net income computation of the investor.

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How do you account for investment in subsidiaries?

The parent company will report the “investment in subsidiary” as an asset, with the subsidiary. Ownership is determined by the percentage of shares held by the parent company, and that ownership stake must be at least 51%. reporting the equivalent equity owned by the parent as equity on its own accounts.

What are the acceptable methods of accounting for an investment in a subsidiary?

Does the subsidiary count as an asset on your balance sheet? There are three accounting methods for this situation, cost, equity and consolidation.

How do you value investments on a balance sheet?

The original investment is recorded on the balance sheet at cost (fair value). Subsequent earnings by the investee are added to the investing firm’s balance sheet ownership stake (proportionate to ownership), with any dividends paid out by the investee reducing that amount.

How should an investment in a subsidiary be accounted for in the separate financial statements of the parent?

If a parent is required, in accordance with paragraph 31 of IFRS 10, to measure its investment in a subsidiary at fair value through profit or loss in accordance with IFRS 9, it shall also account for its investment in a subsidiary in the same way in its separate financial statements.

What factors indicate if the equity method should be used for an investment in another firm’s equity securities?

What factors indicate if the equity method should be used for an investment in another firm’s equity securities? Technological dependency between the investor and investee. Investor representation on the investee’s board of directors. Investor participation in the policy-making process of the investee.

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Is investment an asset or equity?

The balance sheet for your company shows your assets, your liabilities and the owners’ equity. Investments are listed as assets, but they’re not all clumped together.

When a parent loses control of a subsidiary the investment in subsidiary retained by the investor?

36On the loss of control of a subsidiary, any investment retained in the former subsidiary and any amounts owed by or to the former subsidiary shall be accounted for in accordance with other IFRSs from the date when control is lost.

How do you value investment in subsidiary as per Ind AS?

11A If a parent is required, in accordance with paragraph 31 of Ind AS 110, to measure its investment in a subsidiary at fair value through profit or loss in accordance with Ind AS 109, it shall also account for its investment in a subsidiary in the same way in its separate financial statements.

How do you eliminate investment in subsidiary in consolidation?

What is impairment of investment in subsidiary?

Impairment: Investment in. subsidiaries. A goodwill impairment on consolidation indicates a decrease in value since acquisition. This will also trigger an impairment review of the parent entity’s investment in the relevant subsidiary in the parent’s separate financial statements.

When an economy ceases to be hyperinflationary what should be done to the carrying values of the assets and liabilities?

When an economy ceases to be hyperinflationary and an entity discontinues the preparation and presentation of financial statements prepared in accordance with IAS 29, it treats the amounts expressed in the measuring unit current at the end of the previous reporting period as the basis for the carrying amounts in its …

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How do you calculate gain or loss on disposal of subsidiary?

This gain or loss is calculated as the difference between the fair value of the consideration received and the proportion of the identifiable net assets (including goodwill) of the subsidiary disposed of.

Is impairment loss a temporary or permanent difference?

What Is Impairment? In accounting, impairment is a permanent reduction in the value of a company asset. It may be a fixed asset or an intangible asset.

What is impairment loss investment?

The technical definition of the impairment loss is a decrease in net carrying value, the acquisition cost minus depreciation, of an asset that is greater than the future undisclosed cash flow of the same asset.

How do you record impairment losses?

An impairment loss is an asset’s book value minus its market value. You must record the new amount in your books by writing off the difference. Write the asset’s new value on your future financial statements. And, you may also need to record a new amount for the asset’s depreciation.

What is a permanent difference?

A permanent difference is a business transaction that is reported differently for financial and tax reporting purposes, and for which the difference will never be eliminated. … This is income for financial reporting purposes, but is not recognized as taxable income. Penalties and fines.

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Which of the following should be considered when evaluating a web source for credibility




What are 3 things to consider when evaluating a source for reliability credibility )?

The criteria are:

  • Currency: Timeliness of the information.
  • Relevance: Importance of the information for your needs.
  • Authority: Source of the information.
  • Accuracy: Truthfulness and correctness of the information.
  • Purpose: Reason the information exists.

What is a credible source How do you evaluate Web resources?

You can evaluate the reliability and scholarship of information you find both online and in print by using these guidelines:

  • Authorship. If the author is not identified be wary. …
  • Publisher. …
  • Accuracy and objectivity. …
  • Timeliness. …
  • Footnotes and bibliographies. …
  • Sponsorship.

Which of the following should be considered when evaluating a print source for credibility?

—based on three criteria: objectivity, authority, and applicability to your particular assignment. Printed sources, whether primary or secondary, provide the evidence for most of the academic essays you will write in college.

What are the 4 main criteria when evaluating resources?

Evaluate sources of information by examining them for authority, accuracy, objectivity, currency, and coverage.

What are the five things you should use to evaluate a source?

Common evaluation criteria include: purpose and intended audience, authority and credibility, accuracy and reliability, currency and timeliness, and objectivity or bias.

What is important to consider when evaluating sources quizlet?

Terms in this set (10)

When evaluating a source, you should do the following: (Select all that apply.) –Consider the relevance of the topic to your argument. -Check credibility of the source. -Check the objectivity of the author.

How do you evaluate print?

Evaluating a print next to a monitor is not possible unless the print is in an enclosed light box. View your print with a sufficient amount and color temperature of light. We recommend that you illuminate your print directly with a daylight balanced bulb to evaluate. Or, simply view it outside on a sunny day.

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How do you evaluate online sources?

There are six (6) criteria that should be applied when evaluating any Web site: authority, accuracy, objectivity, currency, coverage, and appearance. For each criterion, there are several questions to be asked. The more questions you can answer “yes”, the more likely the Web site is one of quality. What about the news?

Which of the following should you consider when evaluating a website for research proposes?

which of the following should you consider when evaluating a website for research purposes? check to se the author;s background,who published the authors work, and what is the relationship between the aurthor and publisher.

Which of the following should not be considered when evaluating an Internet source for credibility on a topic?

Which of the following should not be considered when evaluating an internet source for credibility on a topic? the amount of relevant information provided by the source. Simply because a source has a lot or a little information to use, does not mean it is a valid source.

What questions should be asked when evaluating a source Check all that apply?

There are four questions to ask when evaluating sources:

  • How well does the source answer the research question?
  • Is the information provided by an expert?
  • Is the source valid?
  • Is there a variety of sources?

What is website evaluation?

Evaluating Websites

The burden of determining the value of information found on the Internet is on the user. You should consider these criteria for evaluating Web resources (Accuracy, Authority, Objectivity, Currency, Coverage, and Relevancy).

What are the key components to evaluate a website?

  • 6 Criteria for Websites. These six criteria deal with the content of Web sites rather than the graphics or site design. …
  • AUTHORITY. Authority reveals that the person, institution or agency responsible for a site has the qualifications and knowledge to do so. …
  • PURPOSE. …
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Why is it important to evaluate the credibility of a website?

Evaluating information encourages you to think critically about the reliability, validity, accuracy, authority, timeliness, point of view or bias of information sources. Just because a book, article, or website matches your search criteria does not mean that it is necessarily a reliable source of information.

What is the role of the websites domain in evaluating website credibility?

The domain of a website gives important clues to its credibility. … Domain names follow patterns established by domain name registering agencies, and you can use those patterns to discern clues about the purpose and geographic origin of a website. Some domains are better sources for credible information.

How might you evaluate the accuracy of a Web site?

How To Evaluate A Website

  1. 1) Open the site. The first thing students need to do is open the site. …
  2. 2) Skim read. …
  3. 3) Look for the answer to your question. …
  4. 4) Consider the credibility of the author or website. …
  5. 5) Consider the purpose of the site. …
  6. 6) Look for the date. …
  7. If the site is no good, bounce back… …
  8. Crosscheck.

How do you evaluate and verify the credibility of a website?

Consider the tone, style and quality of writing. Inappropriate tone and style, and poor grammar and spelling are signals which may indicate poor credibility. Check on line for significance of a domain name if you are unsure.

What do you evaluate when you consider the domain of the page?

When evaluating a website, consider the site’s URL (Uniform Resource Locator), a protocol for specifying addresses on the Internet. The URL can tell you several things about the website: creator, audience, purpose, and sometimes country of origin.

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What is the role of websites domain?

The domain suffix provides you with a clue about the purpose or audience of a Web site. The domain suffix might also give you a clue about the geographic origin of a Web site.

Which website domain is most reliable?

com domains are over 33% more memorable than URLs with other top-level is the #1 most trusted TLD, with . co in a close second place. When people try to remember a URL, they’re 3.8 times more likely to assume it ends in .com than anything else.

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