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A change in the structure of the crystalline lens which results in loss of light and therefore image transmission to the retina.
The ability to perceive differences in color, including hue, saturation and brightness
The thin transparent membrane lining the exposed eyeball and inside surface of the eyelid
Inflammation of the conjunctiva. May be caused by bacteria, virus, allergens or chemical or UV exposure
The turning of the eyes inwards/outwards so that they are both "aimed" towards the object being viewed
The front-most surface of the eye. The transparent "window" and primary focusing lens of the eye.
The shape of the front of the eye
A transparent disk located behind the iris which focuses light onto the retina. The lens has the ability to vary its power to accomodatively focus light from objects closer than optical infinity.