MCQ Detailed View

Myopia, also known as nearsightedness, is a common eye condition in which distant objects appear blurry while close objects can be seen clearly. This happens because the eyeball is slightly elongated or the cornea has too much curvature, causing light rays to converge in front of the retina instead of directly on it.

To correct myopia, a concave lens is used. Concave lenses are diverging lenses that spread out light rays before they enter the eye, ensuring that the focal point moves backward onto the retina. This allows the eye to form a clear image of distant objects. Convex lenses, on the other hand, are used to correct hypermetropia (farsightedness), while cylindrical lenses are used for astigmatism.

The use of concave lenses is the foundation of eyeglasses and contact lenses designed for myopic individuals. The power of the lens is measured in diopters (D), and an optometrist calculates the exact lens power required for each patient based on eye examinations. In addition to glasses, myopia can also be corrected using refractive surgeries like LASIK, which reshape the cornea to focus light correctly on the retina.

Understanding myopia and its correction is a key concept in human biology and optics. It demonstrates how the structure of the eye and light refraction principles work together in vision. This knowledge is also part of everyday science, helping students understand vision problems, optical instruments, and the application of lenses in healthcare.

Correctly identifying the lens type for myopia ensures proper vision correction and improves quality of life for individuals with nearsightedness.