Hello!
I have a pretty bad case of Astigmatism, and I’ve noticed that whenever I tear up briefly (For example after yawning), my vision becomes clearer and I am able to focus on an object easier.
Is there an explanation behind this?
Thanks in advance!
In: 2
Water refracts light (bends/distorts it). So do the lenses in eyeglasses.
If water is at a certain angle relative to your eye, it’s possible for it to function like a crude version of a glasses lens, and partially correct your vision.
I can do it with swimming pools. If my eye is about one inch above the surface of clear water, I get the right amount of refraction to more or less cancel out my short sightedness. I can see what’s under the water with more clarity than I usually get with my naked eyes.
I don’t know if this is a common phenomenon or if it only works for people with really specific kinds of vision problem.
I don’t know the answer to your question exactly, but I can think of a few mechanisms which would have the same effect.
It could be not because of the tears but mechanical. Perhaps whatever triggers the tears, such as a yawn, also temporarily deforms the eye in a beneficial way. Most vision deficiencies are due to the eye being a suboptimal shape.
It could also be related to the pupil size. If whatever triggers tears also shrinks the size of your pupil, that would increase visual acuity. Smaller aperture means wider focus depth, as those skilled in photography know.
Or it could be simply that your eyes aren’t entirely clean and may be slightly dry. Tears both wash away any foreign material and smooth out the surface of the cornea. If this surface isn’t entirely smooth, visual acuity suffers.
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