explain about presbyopia and power of lens?
Answers
Answer:
Presbyopia is a normal part of the aging process. It occurs due to age related changes in lens (decreased elasticity and increased hardness) and ciliary muscle power of the eye, causing the eye to focus light behind rather than on the retina when looking at close objects.
Causes: Aging-related hardening of the lens of the eye
Symptoms: Hard time reading small print, having to hold reading material farther aw...
Other names: The aging eye condition
Treatment: Eyeglasses, contact lenses
Explanation:
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Presbyopia is the gradual loss of your eyes' ability to focus on nearby objects. It's a natural, often annoying part of aging.
If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Converging (convex ) lenses have positive focal lengths, so they also have positive power values. ...