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The pinhole test uses a 1.0 mm hole in an opaque disk to determine how much of a visual problem is due to a "refractive error" rather than ocular pathology (like cataract or macular degeneration). It works by limiting the oncoming rays of light to...

People with good vision (it doesn't even have to be perfect) do not appreciate what it is like to have to wear glasses or contact lenses. Understandably, they think of glasses as akin to an article of clothing that can be readily put on or taken off as needed. In reality,...

Posterior Capsular Opacification (PCO) is the slow haze that develops on the normally clear, cellophane-like envelope (a part of your body) called the "capsule." Before the cloudy lens material was removed and then replaced at the same time with an intraocular lens (IOL),...

The largest letter on an eyechart (the one at the very top) is usually a big "E." This is typically the 20/400 line, meaning that if you cannot read down the chart to smaller size letters, your vision would be recorded as 20/400. But what if you can't even see that size...

Long term use of corticosteroid eye drops can cause a less common type of cataract (lens opacity) called "posterior sub-capsular." Unlike the more common age-related cataracts, these can form fairly quickly. Unfortunately, they are not...

I suspect you mean: can we get rid of any nearsightedness, farsightedness, or astigmatism without having LASIK or other refractive surgery? We all would like to think there might be some "natural" way to eliminate these visual...

I imagine that depends on the "eye of the beholder." In Europe, wearing glasses is often considered a subtle sign of intelligence and education. But in the U.S., wearing glasses (especially in young people) is often seen as an impediment to a fully independent and active...

This would be considered a seriously high degree of myopia (nearsightedness), well beyond the limits of what LASIK can safely correct. However, there is another technology: the ICL (Intraocular contact lens) that would probably work and would certainly be safer than...