What is the consequence of prolonged near work on the ciliary body?

What is the consequence of prolonged near work on the ciliary body?

• A. Ciliary muscle fatigue is unlikely to occur.
• B. Ciliary muscle fatigue leading to blurred near vision.
• C. The ciliary muscle strengthens permanently.
• D. Vision remains unchanged.

Answer: (B)

The focusing muscles of the eye (ciliary muscle) are engaged continuously during near work to make the lens more curved for close focus. When this contraction is sustained for a long time, the muscle fatigues and the eye’s ability to increase the lens curvature (accommodation) diminishes. That reduced accommodative power leads to blurred vision when trying to focus on near objects. This fatigue is temporary and relieved by rest; the muscle doesn’t permanently strengthen from prolonged near work, and vision isn’t unchanged during the effort.

The focusing muscles of the eye (ciliary muscle) are engaged continuously during near work to make the lens more curved for close focus. When this contraction is sustained for a long time, the muscle fatigues and the eye’s ability to increase the lens curvature (accommodation) diminishes. That reduced accommodative power leads to blurred vision when trying to focus on near objects. This fatigue is temporary and relieved by rest; the muscle doesn’t permanently strengthen from prolonged near work, and vision isn’t unchanged during the effort.