nearsightedness Tag

Why do LASIK, PRK, SMILE, and other corneal refractive surgery cause ectasia and other sight-threatening problems even with the most modern lasers?

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...

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in Uncategorized by woodhamseyedev 07 Apr 2024

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How is it possible that one eye can be both myopic and hypermetropic?

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...

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in Uncategorized by woodhamseyedev 24 Mar 2024

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Why are some eyes deep set and others seem so big they bulge?

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...

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in Uncategorized by woodhamseyedev 10 Mar 2024

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Is it the eye that actually determines what we see or the brain that interprets it for us or tries to process it?

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...

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in Uncategorized by woodhamseyedev 10 Mar 2024

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Why do short-sighted people need glasses for up-close vision if they have difficulty with seeing things far away?

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...

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in Uncategorized by woodhamseyedev 25 Feb 2024

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