What you are "seeing" are called "phosphenes. The retina is analogous to film in a camera, located at the very back of the eye. Its nerve cells (photoreceptors and others) can only appreciate a stimulus in one way: by "seeing" light of various wavelengths and intensity....
There is really no situation where you might need to have LASIK and cataract surgery performed at the same time. While it comes as a surprise to many, our eyes each have TWO focusing elements: 1) the "crystalline" (natural) lens, sitting right behind the pupil and 2) the cornea,...
The short answer is "Yes." Many people are unsure whether eye surgery is supposed to be a Vision Insurance or Health (called Major Medical) Insurance benefit. Vision Insurance is generally for routine eye exams, glasses, and contact lenses. Doctors of Optometry are the primary providers, along...
The eye is a complex organ that manipulates light much like a camera does; it has lenses to change the focus and a sensor to recognize intensity and color. How Does the Eye Focus? Starting with the Cornea The first layer of the eye that light hits is...
The eye is a complex organ that manipulates light much like a camera does; it has lenses to change the focus and a sensor to recognize intensity and color. How Does the Eye Focus? Starting with the Cornea The first layer of the eye that light hits is...
We see them as we expect them to appear -right side up! A famous psychology experiment was performed in the 1960s where subjects agreed to wear special goggles that inverted the images entering the eye and being focused on the retina. After a few days of...
One's vision and one's glasses prescription have only a loose correlation. Of course, the higher the Rx number means in general the worse the distance vision. But there isn't any sort of "-3.00 Diopters = 20/400" and "-4.00 D. = 20/800" visual acuity relationship. Once...
With all respect, the premise of your question is incorrect. Far more people wear glasses than contact lenses, but that does not mean contacts are not a "safe and good thing." Many millions of people have refractive surgery on their eyes every year. Most of...
Vuity® is the brand name for a medical eye drop recently FDA approved to reduce the blurry near vision caused by presbyopia in middle-aged adults. The active ingredient in Vuity® is a very old ocular medicine once used to treat glaucoma: pilocarpine. But the concentration (1.25%) is much...
Vitreous "floaters" are the annoying, slightly out-of-focus remnants of the once transparent gel that filled the eye as a child. Since the vitreous has no purpose in the adult eye, it degenerates over time, leaving the floaters suspended loosely in the eye. They typically settle with...