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Before modern technology, how was the strength of eyeglasses determined?

By trial and error in all probability. In its simplest form, a spectacle lens can be either concave (thinning towards the center) or convex (bulging in the center). The former correct myopia (nearsightedness) and the latter, farsightedness. In the modern optical...

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I am in my late 20s. Should I get LASIK eye surgery?

Well, it depends of course on a number of things: I assume you have had a thorough ocular evaluation and know that you are myopic (nearsighted). I would also imagine you have been told you are within the range of myopia and astigmatism where LASIK is safe and that your...

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How much does LASIK surgery cost in 2020?

Charges for the LASIK procedure can vary widely depending on the type of procedure, surgeon and even the region of the country. The range of cost for LASIK per eye is typically between $1,750 to $2,500 in the U.S. , all things included. Often extremely low prices...

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After how much time do dry eye symptoms resolve post-PRK or LASIK?

Dry eye symptoms are by far the most common side-effect of both PRK and LASIK surgery. This is due to the actual (temporary) decrease in tear production by the lacrimal glands. The reason for this is that the laser surgery re-shaping the cornea of the eye unavoidably...

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Do cataracts make night driving difficulty?

Increased difficulty with night driving is a very common presenting symptom of cataract development. As the natural lens hardens with age in the 40s it then begins to discolor. As this discoloration (and often clouding) advances, it begins to...

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Is it true that LASIK surgeries cannot be done after 40 years of age?

No, not at all. LASIK can be performed at almost any age. [My oldest patient was 91!] What matters after age 40 is its ineffectiveness in treating a visual problem not present until the 40s: presbyopia. LASIK is a corneal procedure which is highly...

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Is there any way to reverse/cure presbyopia?

Not in the sense you probably mean -a way to "undo" the age-related hardening of the natural lens so that it can again accommodate, i.e. change shape in response to the muscle squeezing it so as to focus at near. There are intraocular lens implants (presbyopia-correcting...

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Is it possible after cataract surgery, for the newly implanted lens to escape the capsule if it needs YAG laser surgery?

Almost immediately after the cataract operation the capsule (a clear, cellophane-like, elastic envelope) begins to shrink and stick to the IOL. This is fairly secure within a few weeks and extremely secure after about a year. When the YAG laser...

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