Which of the following is NOT a function of mydriatics?

Mydriatics are a class of medications primarily used to dilate the pupils of the eye. This dilation is crucial for various diagnostic procedures, allowing healthcare providers to obtain a better view of the retina and other internal structures of the eye. Therefore, their ability to assist in pupil dilation is a key function of mydriatics.

Additionally, some mydriatic agents also induce cycloplegia, which is the paralysis of the ciliary muscle of the eye, resulting in a temporary inability to focus on near objects. This function is also beneficial during eye examinations, as it provides a clearer view of both the retina and anterior structures without the interference of focusing.

In the context of diagnostic testing, mydriatics play an essential role by facilitating more accurate assessments of the eye's health and function, particularly in detecting conditions like glaucoma or retinal disorders.

The option that identifies pupil constriction is not associated with mydriatics, as these agents are specifically designed to produce the opposite effect—dilating the pupil. Thus, achieving pupil constriction is not a function of mydriatics, making it the correct answer to the question posed.