Photoreceptor

Photoreceptor

A Photoreceptor is a type of neuron or cell that is capable of photosensitivity. These cells are found in the retina of the eye and are responsible for converting light into signals that can be processed by the brain to form visual perception.

Types of Photoreceptors

There are two main types of photoreceptors: rod cells and cone cells.

Rod cells are more sensitive to light and allow for night vision. They are not sensitive to color and are more numerous than cone cells.

Cone cells are less sensitive to light but allow for color vision and visual acuity. They are concentrated in the fovea, the center of the retina.

Function of Photoreceptors

Photoreceptors function by absorbing light and converting it into a chemical or electrical signal. This process is known as phototransduction. The signal is then transmitted to the brain via the optic nerve.

Diseases and Disorders

There are several diseases and disorders that can affect the photoreceptors and impair vision. These include retinitis pigmentosa, macular degeneration, and color blindness.

See Also

• Visual system
• Visual perception
• Eye
• Retina
• Neuron

References

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