define presbyopia with its cause and correction with diagram of position of lens
Answers
Answer:
Presbyopia is the normal loss of near focusing ability that occurs with age. Most people begin to notice the effects of presbyopia sometime after age 40, when they start having trouble seeing small print clearly — including text messages on their phone.
You can't escape presbyopia, even if you've never had a vision problem before. Even people who are nearsighted will notice that their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance vision.
Illustration of the eye anatomy where the eye's lens hardens with age, narrowing your focal point
The eye's lens stiffens with age, so it is less able to focus when you view something up close.
Researchers estimate that nearly 2 billion people worldwide have presbyopia.
Though presbyopia is a normal change in our eyes as we age, it often is a significant and emotional event because it's a sign of aging that's impossible to ignore and difficult to hide.
In parts of the world where there is no access to vision care, presbyopia is much more than an inconvenience — it's a leading cause of vision impairment that reduces people's quality of life and productivity.
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Answer:
presbyopia is a defects of vision
Explanation:
In this defect person is not able to see clearly the object at any position.
* combination of myopia & hypermetropia
it can be corrected by cyclindrical lens