What change is occured in focal length of eyelens for a person suffered from myopic vision ? Answer in short...Please tell...
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Answer:
The focal length of the lens for correcting distant vision =-0.181m. Using P = (1/f) where f= focal length of the lens. The focal length of the lens for correcting distant vision =+0.667m. The far point of a myopic person is 80 cm in front of the eye.
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Answer:
Myopia (also called nearsightedness) is the most common cause of impaired vision in people under age 40. In recent years, its prevalence is growing at an alarming rate.
Globally, research suggests that in the year 2000, roughly 25 percent of the world's population was nearsighted but by the year 2050, it's expected that roughly half the people on the planet will be myopic.Myopia occurs when the eyeball is too long, relative to the focusing power of the cornea and lens of the eye. This causes light rays to focus at a point in front of the retina, rather than directly on its surface.
Nearsightedness can also be caused by the cornea and/or lens being too curved for the length of the eyeball. In some cases, myopia occurs due to a combination of these factors.
Myopia typically begins in childhood, and you may have a higher risk if your parents are nearsighted. In most cases, nearsightedness stabilizes in early adulthood but sometimes it continues to progress with age.