Definition

1. Noun:
   • A type of eye with a single lens: A "simple eye" is a visual organ found in some invertebrates that consists of only one lens. It contrasts with compound eyes, which have multiple lenses. This structure provides a basic form of vision, often detecting light, shadow, and movement rather than forming detailed images.

Usage Examples

• Noun:
  • The spider uses its simple eyes to detect changes in light intensity.
  • Compared to the bee's compound eye, the simple eye of a caterpillar has a much narrower field of view.

Advanced Usage

• In biological classification: The term is used to describe the ocelli in insects and other arthropods.
  • The dragonfly has three simple eyes, or ocelli, on the top of its head in addition to its two large compound eyes.

Variants and Related Words

• Ocellus (noun): The scientific term for a simple eye, especially in insects and other invertebrates.
  • The ocelli are thought to help the insect maintain stability during flight.

Synonyms

• Ocellus: A direct synonym used in scientific contexts.
• Stemmata: A term sometimes used for the simple eyes of insect larvae.

Related Phrases

• Single-lens eye: A descriptive phrase explaining the structure of a simple eye.
  • The evolution of the single-lens eye was a major development in visual systems.

Noun

1. an eye having a single lens