Which condition refers to impaired vision due to aging?

The condition that refers to impaired vision due to aging is presbyopia. This is a natural part of the aging process that typically begins in early to mid-40s. As people age, the lens of the eye becomes less flexible, making it difficult for the eyes to focus on close objects. Symptoms often include difficulty reading small print or seeing objects up close without the aid of reading glasses.

Other conditions listed relate to vision but have different causes or characteristics. Astigmatism is caused by an irregular curvature of the cornea or lens and leads to blurred or distorted vision at all distances. Myopia, commonly referred to as nearsightedness, occurs when the eyeball is too long or the cornea is too steep, causing distant objects to appear blurry. Hyperopia, or farsightedness, is when the eyeball is too short or the cornea is too flat, leading to difficulty focusing on close objects. Therefore, presbyopia specifically relates to the age-related changes in vision, distinguishing it from these other refractive errors.