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Definition of «Retina»

Retina: The retina is the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain. There is a small area, called the macula, in the retina that contains special light-sensitive cells. The macula allows us to see fine details clearly.

The eye has a number of other components. These include the cornea, iris, pupil, lens, optic nerve and vitreous.

The cornea is the clear front window of the eye that transmits and focuses light into the eye.

The iris is the colored part of the eye that helps regulate the amount of light that enters the eye.

The pupil is the dark aperture in the iris that determines how much light is let into the eye.

The lens is the transparent structure inside the eye that focuses light rays onto the retina.

The optic nerve is the nerve that connects the eye to the brain and carries the impulses formed by the retina to the visual cortex of the brain.

The vitreous humor is a clear, jelly-like substance that fills the middle of the eye.

For More Information «Retina»

  • retina: Definition from Answers.com

    Library > Literature & Language > Dictionary ( rĕt ' n-ə ) n. , pl. , ret·i·nas , or ret·i·nae ( rĕt ' n-ē ' ). A delicate, multilayered, light-sensitive ...

  • Simple Anatomy of the Retina – Webvision

    Helga Kolb . 1. Overview. When an ophthalmologist uses an ophthalmoscope to look into your eye he sees the following view of the retina. In the center of the retina is the ...

  • Retina - 2008/9 Wikipedia Selection for schools

    The vertebrate retina is the light sensitive inner layer of the eye. Two of its three types of photoreceptor cells, rods and cones, receive light and transform it into ...

  • retina - definition of retina in the Medical dictionary - by ...

    retina /ret·i·na/ (ret´ĭ-nah) [L.] the innermost tunic of the eyeball, containing the neural elements for reception and transmission of visual stimuli.

  • Retina - Scholarpedia

    Figure 1: The retina (right) consisting of photoreceptors, second-order horizontal, bipolar and amacrine cells and third- order ganglion cells, lines the back of the eye ...