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The causes are in the categories of:
Cerebral causes affect both eyes equally, whereas the other causes may each affect a single eye. Accommodational causes are usually but not invariably bilateral.
Optical
Plus spectacle lenses magnify and minus lenses minify. A person will become aware of macropsia/micropsia when there has been a change in their optical status. This occurs when a hypermetrope parts with their plus spectacles and opts for contact lenses, laser sight correction, or lens implants. The person may be disappointed with their new emmetropia because of the loss of magnification and the proportional reduction in visual acuity that goes with it. Patients undergoing laser sight correction should always be warned that they may lose a line of best corrected visual acuity and that this is more likely in the hypermetrope.
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