Blog

I assume you mean to get an otherwise equivalent glasses Rx, but without any astigmatism correction? If so, yes, it is quite easy to determine the "spherical equivalent" Rx. You take ½ the amount of cylinder (astigmatism correction) and add it to the spherical component...

LASIK works by thinning and flattening the cornea, the clear dome overlying the pupil and iris. The amount of corneal thinning is proportional to the degree of nearsightedness (myopia) being treated. When one is trying to treat such a high prescription as -14 diopters,...

You should make an appointment with a good eye doctor who will dilate your eyes. They will want to carefully examine your retina to make sure there are no holes, tears, or weak areas. These could potentially be the source of the floaters and would probably be treated at...

You are right that visual acuity is not the sum total of measuring visual function in the eye. Eye charts are typically totally black letters against a bright white background -100% contrast. But the real world is mostly moderate to low contrast -browns against Grays;...

Because there are two different types of vision at work. Straight-ahead vision puts an image on the macula, at the geographic center of the retina. [The retina is the "film" in the camera analogy of the eye.]The macula is packed very tightly with "cone" photoreceptor...

With rare exceptions, you can reasonably expect it to be a quick, painless procedure that after a few days will result in noticeably better vision. All surgical procedures, no matter how routine, carry some risk and cataract surgery is no different. Scary as it may be...

It would be normal to expect that your vision with contact lenses or with glasses would be the same. But this is not the case! The distance between a corrective lens and the eye is a significant factor in a glasses Rx. This is rarely noticeable in low power prescriptions....

A cataract is the natural lens that has undergone age-related degenerative changes. So as a lens, it has a prescription, much like your glasses have a prescription. As the natural lens goes through the age-related degeneration that results in it becoming a cataract, the...