The Human Eye and the Colourful World — Chapter Summary

The eye is approximately spherical

The eye is approximately spherical with a diameter of about 2.3 cm. Light enters through the cornea, which is a thin transparent membrane forming the

The eye lens is fibrous

The eye lens is fibrous and jelly-like. Its curvature is changed by the ciliary muscles. When the muscles relax, the lens becomes thin and its focal l

The minimum distance at which

The minimum distance at which an object can be seen most distinctly without strain is called the least distance of distinct vision, or the near point.

In old age

In old age, the crystalline lens may become milky and cloudy. This condition is called cataract and can cause partial or complete loss of vision. Visi

Myopia

Myopia, or near-sightedness, is a defect in which nearby objects are seen clearly but distant objects are not seen distinctly. The far point is nearer