Final answer:
The average near point of accommodation for a 20-year-old is approximately 25 cm. Accommodation refers to the ability of the eye to change its focus from distant to close objects. As we age, the near point of accommodation gradually increases, making it harder to focus on close objects.
Step-by-step explanation:
The average near point of accommodation for a 20-year-old is approximately 25 cm.
Accommodation refers to the ability of the eye to change its focus from distant to close objects. When we focus on a close object, the ciliary muscles in the eye contract, causing the lens to thicken and increase the eye's focusing power.
The near point of accommodation is the closest distance at which an object can be brought into focus on the retina.
For a 20-year-old, the near point of accommodation is typically around 25 cm, which means that objects closer than 25 cm appear blurry. As we age, the near point of accommodation gradually increases, making it harder to focus on close objects.