Final answer:
Age-related changes and impurities in the lens can lead to vision problems such as glare and difficulty seeing in dim light. Conditions like presbyopia and hyperopia arise from such changes, which can be corrected with convex lenses in eyeglasses.
Step-by-step explanation:
Impurities form in the lens with age, giving rise to problems with glare and seeing in dimly lit settings. These impurities and changes in the structure of the eye's lens lead to conditions such as presbyopia, which is an age-related condition characterized by the lens of the eye becoming less flexible, affecting the ability to focus on close objects. The condition of the lens muscles weakening and not being able to pull hard enough on the edges to make it less convex, mentioned in the reference materials, causes hyperopia (farsightedness), where images are focused behind the retina instead of on it, resulting in blurry close vision.
In older adults, to correct these vision problems, eyeglasses with convex lenses are typically prescribed to help converge light rays onto the retina, thereby improving focus on near objects for those with presbyopia or improving near vision for those with hyperopia.