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Long-sightedness, requiring a convex lens to focus the vision.

Far-sightedness, an eye that is too short and/or insufficiently powered. The image forms behind the retina, which explains why the hyperopic subject has better eyesight in far vision than in near vision. In cases of mild hyperopia, the subject sees correctly in far vision by compensating the hyperopia through accommodation. In cases of severe hyperopia, the eye can no longer compensate in this way. Focusing defect in which an eye is underpowered. Light rays coming from a distant object strike the retina before coming to sharp focus, causing blurred vision. Corrected with plus (convex) lenses.

Circular membrane that delimits the pupil. The iris acts as a diaphragm that contracts according to the intensity of light. Pigmented tissue lying behind the cornea that gives color to the eye (e.g., blue eyes) Controls light by contracting and constricting the opening (pupil).