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A small round ball of eye can consist almost 20 layers of tissues, just to justify it function of controling light entrance, that is something.. (reader: what is something?) (me: sweatdrop )
Spectacles help eyes (specifically the lens) to view better image. It helps the eyes to 'accomodate', so it takes time for the eye to get use.. maybe few years later, the eye will get used to the condition & lesser power of lens is needed to be change.. ? question
some might have very bad sight, that even spectacles could not help. This is when contact lens come in.. Nowadays, contact lens is more used for cosmetics purposes.. sweatdrop

See a black dot everytime you use you eyes to look? eek it could be early stage of cataract (or glaucoma?). i left untreated, the dot will spread with time, & at the last stage, (untreatable stage) all is left to see is just a hole size view..



When someone get a headache, it could be many expression.. 'Strong punch in my head', 'thousands of pricking needle', 'spinning environment'...
The last complaint brings doctor to diagnose vertigo, which can be cause by disturbances of wiring that connect the ear component responsible for balance, called Cochlear, with any part of the brain (it could be the main brain (cerebrum), the brain stem, or cerebellum); or disturbance in the cochlear itself..