Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Difficulty in reading and close work, often persistently increasing, is experienced by most of patients suffering from primary open angle glaucoma. These patients usually complain of frequent changes in presbyopic glasses.
Reason (R) : In patients of open angle glaucoma, the above problem is due to increasing accommodative failure as a result of constant pressure on the ciliary muscle and its nerve supply.
In the light of the above statements, choose the most appropriate answer from the options given below :