Which of the following is an example of an anticholinergic used in the eye?

Cyclogel is an example of an anticholinergic agent used in the eye because it contains the active ingredient cyclopentolate, which works by blocking the action of acetylcholine on muscarinic receptors in the eye. This action results in dilation of the pupil (mydriasis) and paralysis of the ciliary muscle (cycloplegia), making it useful for procedures like eye examinations and surgeries by helping to provide a better view of the retina and other internal structures.

Diamox, on the other hand, is a carbonic anhydrase inhibitor primarily used to manage conditions like glaucoma and high-altitude sickness but does not have anticholinergic properties. Pilocarpine is a cholinergic agent that acts by stimulating the muscarinic receptors, promoting pupil constriction, which is opposite to the effects of anticholinergics. Timolol is a beta-blocker used to decrease intraocular pressure in glaucoma management, but it does not function as an anticholinergic either. Therefore, Cyclogel is distinctly positioned as an anticholinergic within this context.