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Emmetropia     
When a distant image is focused perfectly on the back of the retina when accommodation is at rest this condition is termed emmetropia. The eye functions like a camera – it has an optical system (the tear film cornea aqueous humor lens and vitreous humors) and a light-responsive film (the retina). The image of an object is in focus on the retina when the optical power and the length of the eye are equal. The length of the eye is fixed but the power of the eye can be changed by a process ca...Read More
 
 
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