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The most common errors encountered irregularities odaklaştırılmasında at a point contact. They are divided into four species.

Myopia: (Far sickness) can easily be seen in nearby objects. The remote can not be seen clearly.

Farsightedness (nearby sickness): There is no difficulty in seeing short sighted. Nearby objects clearly visible.

Presbitlik: aging as a natural problem arises. hardened before the eyepieces near vision impaired.

Astigmatlık: transparent layer in front of the eye (the cornea), slope of the least symmetrical of all objects appear as blurry.

These defects düzeltiebilir using appropriate spectacle lenses. Changing the angle of the rays from the windows afford vision disorder resolves. For example, the concave lens Nearsightedness, farsightedness, and a convex lens and astigmatlık presbitlik corrected using a special lens.