No. "Cataract" is not a disease, nor is it some sort of film or haze covering the natural lens of the human eye. It is the eye's lens material itself hardening, becoming discolored, and eventually clouding up as an inevitable development of aging. This hardening of...Continue Reading
Does the ophthalmologist have equipment that can objectively measure whether someone has double vision, and not just from the patient saying they do?
Of course we do! Not only can we confirm objectively that the eyes are not in proper alignment, we can measure the degree of it in all directions of gaze. Sometimes, a complaint about double vision (called "diplopia") can be in just...Continue Reading
Before Lasik, my eyes were -0.5/-0.75, I was told I was nearsighted. I was given what my eyes are now after Lasik, and they are +0.5/+0.5? I have more trouble seeing up close now. Aren't I just farsighted now to the extent I was nearsighted?
Yes, you are. Your original nearsighted prescription was quite low. While that is not necessarily a contraindication to needing or wanting to have LASIK, you have only gained a little distance sharpness from it. If you are under 40 years of age, that little bit of...Continue Reading
Can it be determined how many diopters a person’s eyesight will change over the course of their presbyopia, or does it depend person to person?
The default focal point of the normal human eye is way off at the horizon. To pull the focus up close requires a physical change in the shape and thickness of the natural lens of the eye called "accommodation." This change in focusing power is measured in the same units...Continue Reading
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...Continue Reading
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,...Continue Reading
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),...Continue Reading
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...Continue Reading