Which of the following best describes the action of mydriatics on vision?

Mydriatics are medications used to dilate the pupils of the eye. The primary action of mydriatics is to induce pupillary dilation, which allows more light to enter the eye. This increased light entry can improve visibility in low-light conditions, making it easier to observe details in the environment. Dilating the pupil also facilitates examination of the interior structures of the eye during medical evaluations.

While the dilation from mydriatics may influence how a person perceives light and depth, they do not specifically improve peripheral vision or enhance reading ability. Additionally, mydriatics do not prevent lens accommodation in the usual sense; rather, they temporarily affect the eye's ability to focus by altering the pupil size. Therefore, the correct answer is that mydriatics allow greater light entry into the eye.