Which of the following is NOT a function of the retina?

The retina is primarily responsible for the transduction of light into neural signals, which are then relayed to the brain for visual processing. This process involves photoreceptor cells (rods and cones) that capture light and convert it into electrical impulses.

Regulating the entry of light is crucial as the retina works together with other parts of the eye, particularly the iris and pupil, to control how much light reaches it, although the actual light regulation is not a direct function of the retinal tissue itself. The retina does play a significant role in processing visual information by integrating signals from photoreceptors and passing them through various layers of retinal cells before sending them to the brain.

However, maintaining ocular pressure is not a function of the retina. Ocular pressure is primarily regulated by the production and drainage of aqueous humor through structures like the ciliary body and trabecular meshwork, not by the retinal tissue. Therefore, it is accurate to state that maintaining ocular pressure does not fall under the functions of the retina.