Definition

1. Noun:
   • The light-sensitive layer of tissue at the back of the inner eye: The retina is the innermost membrane lining the eyeball. It receives light focused by the lens, converts it into neural signals, and transmits these signals to the brain via the optic nerve, enabling vision.

Examples of Usage

• Noun:
  • The ophthalmologist examined the patient's retina for signs of disease.
  • Light entering the eye forms an image on the retina.
  • A detached retina is a serious medical condition requiring immediate treatment.

Advanced Usage

• "Retinal" (adjective): Pertaining to the retina.
  • Retinal scans are used for biometric identification.
• In medical/technical contexts: The retina is often discussed in terms of its components, such as rods and cones (photoreceptor cells).
  • The cones in the retina are responsible for color vision.

Variants and Related Words

• Retinal (adj): Of or relating to the retina.
• Retinitis (n): Inflammation of the retina.
• Retinopathy (n): Any disease of the retina.

Synonyms

• Light-sensitive layer: A descriptive synonym emphasizing its function.
• Neuroretina: A more specific term highlighting its neural tissue composition.

Related Phrases

• Retinal detachment: A disorder where the retina peels away from its underlying layer of support tissue.
• Retina display: A brand name for a type of high-resolution screen, metaphorically named for its sharpness, akin to the detail perceived by the human retina. (Note: This is a proprietary term and a distinct, advanced usage from the primary anatomical definition).

Related Idioms

Noun

1. the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve