parafovea

Parafovea is the region of the retina surrounding the fovea centralis. It forms part of the macula and extends roughly from about 1.5 to 5 degrees of visual angle from the foveal center, transitioning to the perifovea as distance from the fovea increases. The parafovea contains a high density of cone photoreceptors, though fewer than the fovea, and has the inner retinal circuitry organized to support high-acuity vision. Compared with the fovea, receptive fields in the parafovea are larger, and while color vision is preserved, overall spatial resolution is reduced.

Functionally, the parafovea contributes to detailed vision together with the fovea and participates in parafoveal processing during activities such as reading and scene perception. It enables processing of information from stimuli near the point of fixation, a capability demonstrated by parafoveal preview effects observed in reading and other tasks.

Clinically, the parafovea is a key region in macular diseases. Conditions such as age-related macular degeneration can involve parafoveal regions, affecting central vision and reading ability. Imaging techniques like optical coherence tomography and fundus photography assess parafoveal thickness, the integrity of the retinal layers, and parafoveal vascularization to monitor disease progression and treatment effects.