Name the lens used to correct hypermetropia?
The correct answer and explanation is:
The lens used to correct hypermetropia is a convex lens.
Hypermetropia, also known as farsightedness, is a refractive error where distant objects are seen more clearly than nearby ones. This occurs because light entering the eye focuses behind the retina rather than directly on it. This misfocus happens when the eyeball is too short or the cornea has too little curvature.
The primary role of a convex lens is to converge light rays. When a convex lens is placed in front of the eye, it bends the incoming light so that it focuses properly on the retina, allowing the person to see close objects clearly. In a person with hypermetropia, the convex lens compensates for the eye’s inability to focus light on the retina by helping to direct the light correctly.
Convex lenses are thicker at the center and thinner at the edges. The curvature of the lens increases the bending of light rays as they enter the eye, moving the focus point forward to the retina. This brings closer objects into focus, allowing people with hypermetropia to view nearby objects more comfortably.
In addition to helping with near vision, convex lenses can also help reduce eyestrain or headaches caused by prolonged efforts to focus on close objects. The use of convex lenses is a common and effective treatment for hypermetropia, often prescribed as eyeglasses or contact lenses, depending on the severity of the condition and the patient’s preference. For severe cases, surgical options such as LASIK might be considered, but convex lenses remain the most straightforward and widely used correction method.