Facultative hypermetropes manage to see because of:
**Core Concept**
Facultative hypermetropes, also known as hypermetropic individuals with a high degree of accommodation, can see distant objects clearly due to their ability to accommodate. This is achieved through the ciliary muscles' contraction, which increases the curvature of the lens, allowing for a more focused image on the retina.
**Why the Correct Answer is Right**
The correct answer is related to the mechanism of accommodation in the eye. In facultative hypermetropes, the ciliary muscles contract, increasing the curvature of the lens, which allows for a more focused image on the retina. This is made possible by the presence of zonular fibers, which connect the lens to the ciliary body and help to control the shape of the lens. When the ciliary muscles contract, the zonular fibers relax, allowing the lens to become more spherical and focusing light more effectively on the retina.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the mechanism of accommodation in facultative hypermetropes.
**Option B:** This option is incorrect because it is not relevant to the ability of facultative hypermetropes to see distant objects clearly.
**Option D:** This option is incorrect because it is not a mechanism of accommodation in the eye.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that facultative hypermetropes can see distant objects clearly due to their ability to accommodate, but this can lead to fatigue and decreased vision with prolonged near work.
**Correct Answer: B. Contraction of ciliary muscles to increase the curvature of the lens.**