Lenses in spectacles correct vision defects by altering the path of light entering the eye. Convex lenses are used to correct hypermetropia (long-sightedness), while concave lenses are used for myopia (short-sightedness). The correct lens helps in focusing the image directly on the retina.
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Lenses used in spectacles correct vision defects by altering the way light enters the eye. Convex lenses, thicker at the center, help converge light and are used to correct farsightedness (hyperopia). Concave lenses, thinner at the center, diverge light and are employed for nearsightedness (myopia). These lenses adjust the focal point, ensuring that the image focuses precisely on the retina. Bifocal or multifocal lenses combine different prescriptions to correct multiple vision issues. Corrective lenses compensate for refractive errors, enabling the eye to form a clear image on the retina and providing individuals with improved visual acuity.