Condition Glasses are Used to Correct

If you've ever been to a classic 3-D movie, then you remember the cardboard glasses with one blue and one red lens.

The ability for the eyes to focus ideally is called emetropia, and is when parallel rays of light entering the eye and join at the retina. Individuals with emetropia do not generally need prescription lenses. Prescription glasses are fitted to a person to compensate for visual problems that individual is suffering. Myopia- nearsightedness, shortsightedness is when distant objects are blurred. This is caused by their images being focused in front of the retina of the eye instead
of on it. Hyperopia-farsightedness, long-sightedness is a condition when the eyeball is too short from front to back. This causes images to be focused behind the retina, thus making object at a distance clearer.

Astigmatism is a condition in which the unequal curvature of one or more refractive surfaces of the eye causing blurred and halo vision.

Presbyopia occurs in most people during the aging process. The eye's crystalline lens loses elasticity resulting in the inability to focus on nearby objects.

None of these conditions are disease, nor are they life threatening.


 




 

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