A thin membrane through which light enters the human eye is called ______

Key Points

• The cornea is a transparent, dome-shaped membrane located at the front of the eye that allows light to enter.
• It acts as the eye's outermost lens, playing a critical role in focusing light onto the retina for vision.
• The cornea has no blood vessels; instead, it receives nutrients through tears and aqueous humor.
• It provides approximately 65-75% of the eye's total focusing power, making it essential for clear vision.

Additional Information

• Retina:
  • The retina is a thin layer of tissue at the back of the eye that contains photoreceptor cells (rods and cones).
  • It converts light into electrical signals, which are sent to the brain via the optic nerve to produce visual images.
• Pupil:
  • The pupil is the black circular opening in the center of the iris that regulates the amount of light entering the eye.
  • It adjusts its size based on light intensity—dilating in low light and constricting in bright light.
• Cornea:
  • The cornea is the clear, protective outer layer of the eye that covers the iris and pupil.
  • It serves as the eye's primary refractive surface, focusing incoming light onto the retina.
  • The cornea is highly sensitive due to the presence of numerous nerve endings.
• Iris:
  • The iris is the colored part of the eye surrounding the pupil.
  • It controls the size of the pupil to regulate light entry into the eye.