Glasses

[sp1214]

Does either the introduction OR a new pair of glasses with greater manification cause your normal vision without glasses to deteriorate much quicker?

[meredith101]

Yes it does.
My friend is a vision scientist.
He arrived at work and forgot his glasses.
He went for 2 days without finding them, noticed improved vision.
He ran experiments and came up with a theory of how this should occur.
It is very hard to digest.
It is related to contrasts and spatial frequencies.
Much of the visual system occurs not within the eye or even the optic nerve, but the brain itself, in the visual cortex, V1, V2, V3 etc, in a set of pathways.
The habitual use of corrective glasses or contacts causes changes in this part of the brain. The promotion of certain ranges of apatial frequencies over others occurs when you stop wearing glasses again, and this would improve your 'natural' vision.
I have links if you like.
I think visual sciences are the most interesting of all science, but can be hard to digest, takes no prisoners. Vision is crazy man. Wait til you see the auditory system.

[chakka35]

No, it doesn't.

Meredith is confusing two different things. It may well be that, without the required glasses, the brain might make certain adjustments which make seeing slightly easier (though I've never noticed it) but the question was whether the wearing of glasses makes the glasses-free sight worse. There is no reason why it should.

Incidentally, not all glasses magnify. Those worn by short-sighted people (the ones you see being worn constantly) do the opposite.

[sp1214]

The reason why I posed the question is because I have had new glasses with a stronger magnification. I notice that when I take them off focussing seems more of a blur than before.