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How is it possible that one eye can be both myopic and hypermetropic?

I wonder if you mean to ask "How can one eye be both nearsighted AND farsighted." Unless one is talking about mixed (compound) astigmatism, you can't actually have a myopic (nearsighted) AND hyperopic (also called "hypermetropic") eye. But you can be nearsighted AND...

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What is the highest prescription for Lasik?

There is not really any sort of "guardrail" number of diopters that can be successfully AND safely treated with LASIK. In general, the higher the prescription to correct your myopia (nearsightedness) and astigmatism, the more stress you are creating on your cornea over...

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Can lenses from cataract surgery (IOLs) be replaced?

Yes, but it can be difficult to do so. It is quite possible (and not particularly risky) to remove and replace an IOL early after surgery -within the first 2-3 months or so. But if you wait a whole lot longer than that, the IOL will have had enough time to become firmly...

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Can you get Lasik after 40?

Yes, you can. But remember LASIK is only able to correct myopia (nearsightedness) and astigmatism. While there is one type of farsightedness LASIK can address (hyperopia) this is not the farsightedness everybody gets as they enter into their 40s (presbyopia). Presbyopia...

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What are the symptoms of a secondary cataract (cloudy capsule)?

As a practicing ophthalmologist, the symptom that usually tips me off to look for a cloudy capsule is when patients start to experience a decrease in their reading vision. There is also often a corresponding in the quality of vision at night, especially noticeable when...

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What is the best way to explain the Snellen eye chart results?

When you are told "your vision is 20/20 -or 20/40, or 20/whatever" you are being given a ratio of the chart distance/smallest line able to be read. While the most accurate explanation of this is in terms of arc angle subtended, etc. the easiest way to understand it is to...

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Is the chart you look at while taking an eye exam called a Snellen chart?

The Snellen distance eye chart is the most common kind of visual acuity testing format. It was developed in 1862 by a Dutch ophthalmologist, Herman Snellen so is quite old and arguably out-of-date. Improved versions are now available, such as the EDTRS or LogMar chart....

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Why do we not need eyeglasses after cataract surgery even with no reading glasses?

Cataract surgery is essentially the removal of the old, hardened and discolored natural lens so as to replace it with a new, clear artificial lens implant. Since the ocular surgeon is already there, so to speak, it is possible to use a lens...

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