Definition

1. Adjective:

   • Pertaining to the retina: Relating to or affecting the retina, which is the light-sensitive layer of tissue at the back of the inner eye.
   • Characteristic of the retina: Having the properties or functions associated with the retina.

2. Noun:

   • A chemical pigment: Either of two yellow to red pigments (retinaldehyde) derived from vitamin A, which are essential for vision as they are the light-absorbing component of visual pigments like rhodopsin in the retina.

Usage Examples

• Adjective:
  • The doctor detected a retinal tear during the examination.
  • This condition requires specialized retinal imaging.
• Noun (less common in everyday speech, more technical):
  • Rhodopsin is a protein that contains retinal and absorbs light.
  • The isomerization of retinal is the first step in the visual process.

Advanced Usage

• Retinal detachment: A serious medical condition where the retina pulls away from its underlying supportive tissue.
  • He underwent emergency surgery for a retinal detachment.
• Retinal scan: A biometric identification method that uses unique patterns on a person's retina.
  • High-security areas sometimes use retinal scans for access.

Variants and Related Words

• Retina (n): The sensory membrane lining the inner eyeball.
  • The image is focused onto the retina.
• Retinitis (n): Inflammation of the retina.
  • The patient was diagnosed with retinitis pigmentosa.

Synonyms

• Adjective: None that are exact. Descriptive phrases like "pertaining to the retina" or "of the retina" are used.
• Noun: Retinaldehyde, vitamin A aldehyde.

Related Phrases

(Note: As a technical term, it is not commonly used in phrasal verbs or idioms.) - Retinal blood vessels: The vessels that supply blood to the retina. - Hypertension can damage the retinal blood vessels. - Retinal pigment epithelium (RPE): A layer of cells that supports the retina. - The health of the retinal pigment epithelium is crucial for vision.

Adjective

1. in or relating to the retina of the eye
   • retinal cells

Noun

1. either of two yellow to red retinal pigments formed from rhodopsin by the action of light