normal eyes has 3D vision activity. But, contact lenses , spectacles , surgeries could not restore this 3D vision .
for example looking at sunset sceen . See the sky. You will enjoy the sattered coloures in sky coming near to you.
If you are myopic and using spectacles then you can not enjoy this sceen. you see through glass. next example. suppose one has climbed high on tree and you are looking him from ground. You get fear that person should not fall on ground. But , by wearing spect this sensation get loss because 3D vision is not there.
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