Myopic (near- or short-sighted) eyes are typically a larger diameter than "normal" eyeballs. The focusing parts of the front of the eye (cornea, natural lens, and pupil) do not "know" this, so they focus a distant object too soon inside the eye: the image is in...
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...
It depends on how bad the hyperopia is and your particular vision needs. We see many Delta pilots at the clinic -almost all of them are hyperopic! But they rarely know it and almost never have even heard of hyperopia. Hyperopes have usually never worn glasses...
People have different size globes (eyeballs) which is often an indicator of being near- or farsighted (myopic and hyperopic). Hyperopic eyeballs are almost by definition smaller than normal, having failed to grow to the normal size (+23.0 mm). While vision can be normal in their younger...
Strange as it may sound, the answer depends on what you have been used to before you had the cataract/IOL surgery. A myopic (nearsighted) person typically always had good near vision with or without glasses. So losing most of that, despite now being able to see 20/20 at...
I wonder if you mean to ask "How can one eye be both nearsighted AND farsighted." Unless one is talking about mixed (compound) astigmatism, you can't actually have a myopic (nearsighted) AND hyperopic (also called "hypermetropic") eye. But you can be nearsighted AND farsighted. There are TWO types of what people call farsightedness: hyperopia...
Is it the eye that actually determines what we see or the brain that interprets it for us or tries to process it? The eyes can be open but, lack the ability to see even when observing things. Are eyes really what people use to...
Yes, but it can be difficult to do so. It is quite possible (and not particularly risky) to remove and replace an IOL early after surgery -within the first 2-3 months or so. But if you wait a whole lot longer than that, the IOL...
Since a cataract is a cloudy natural lens, every cataract operation involves replacing it with a new, artificial lens implant: an IOL (Intraocular Lens Implant). The cost of the "entry level" IOL is included in the packaged fee that Medicare pays to the ambulatory surgical center (ASC) or...
All of these procedures work by removing tissue, leaving the cornea permanently thinner. This intrinsically stresses the cornea's structural integrity: these procedures work by weakening the cornea optically -but hopefully not structurally (or at least not very much). This is exactly the opposite of what...