Final answer:
Presbyopia is the vision condition associated with aging where the lens becomes less flexible, causing difficulty in focusing on close objects. It is distinct from hyperopia, which can also cause farsightedness, but presbyopia specifically refers to the aging lens's reduced elasticity. Presbyopia is typically corrected with glasses that include a converging lens.
Step-by-step explanation:
Understanding Farsightedness and Presbyopia
The type of farsightedness that involves the lens of the eye becoming brittle and inflexible with age is termed presbyopia. This condition typically becomes noticeable between the ages of 40 and 50. Farsightedness, or hyperopia, is the inability to see close objects clearly and is often corrected with a converging lens to increase the power of the eye. While hyperopia may be due to the eye being too short or the lens having insufficient optical power, presbyopia specifically arises as the eye's lens loses elasticity over time. Corrective lenses are common solutions to increase the focusing ability of the eye and mitigate the effects of both conditions. However, it's useful to note that surgical procedures to correct presbyopia have not been as successful as those for myopia or other forms of hyperopia.
In terms of addressing the provided question, presbyopia is different from simple hyperopia, myopia, and astigmatism. This age-related condition specifically points to the lens's reduced flexibility, leading to difficulties in focusing on close objects, which is not explained by hyperopia alone. Therefore, the correct answer to the question would be presbyopia (d).