Which type of lens is primarily used for correcting hyperopia?

Hyperopia, commonly known as farsightedness, occurs when light entering the eye is focused behind the retina, primarily due to the eye being too short or the cornea having too little curvature. To correct hyperopia, lenses that converge light rays before they enter the eye are required, enabling them to focus on the retina more accurately.

Convex lenses, also known as plus lenses, are specifically designed for this purpose. They are thicker at the center compared to the edges and are effective in bending light rays inward, allowing the light to focus correctly on the retina for those with hyperopia.

The other types of lenses mentioned serve different purposes. Concave lenses are used to correct myopia (nearsightedness) by diverging light beams. Aspheric lenses can reduce distortion and provide superior optical quality, but they are not the primary option for hyperopia correction. Monofocal lenses describe a lens type with a single focal point and can be convex for hyperopia, but they do not specify the corrective function inherently like convex lenses do. Thus, convex lenses are the most appropriate choice for correcting hyperopia.