eye

• What is the iris reflex for bright light?

  The circular muscles contract, the radial muscles relax, so that the pupil can constrict, allowing fewer light rays to avoid overexposure.
• What is eye's accommodation for near objects?

  The ciliary muscles contract, causing the suspensory ligaments to slacken so that the lens becomes fatter. This is so that the light rays of near object- which enter at a steeper angle- can be refracted more for an accurate image.
• Cornea: A transparent lens that refracts light as it enters the eye
• Iris: the colored part of the eye that consists of smooth muscles (circular and radial), allowing it to control the amount of light entering the pupil
• Lens: Transparent disc that can change shape to focus light into the retina
• Retina: A light sensitive layer at the back of the eye containing light receptor cells - rods (detect light intensity) and cones (detect color)
• Optic nerve: carries impulses or visual information between the eye and the brain
• Pupil: The opening in the center of the iris that allows light to enter the eye.
• Ciliary muscle: A ring of muscle that contracts and relaxes to change the shape of the lens
• Suspensory ligaments: A pair of ligaments that connect the ciliary muscles to the lens
• Sclera: strong, white outer wall of the eyeball that keeps it in shape and provides a place of attachment for the muscles that move the eye
• Fovea: A region of the retina with the highest density of cones where the eye sees particularly good detail
• Vitreous humor: A gelatinous substance that fills the cavity of the eyeball.
• Aqueous humor: Watery liquid that fills the chamber between the cornea and the lens
• Choroid: A pigmented / dark layer of tissue lining the inside of the sclera that prevents the reflection of light rays inside the eyeball
• Blind spot: The place on the retina where the optic nerve starts and contains no receptor cells
• eye diagram

  A) Suspensory Ligament

  B) Sclera

  C) Retina

  D) Fovea

  E) Optic nerve

  F) Cornea

  G) Iris

  H) Pupil

  I) Lens

  J) Ciliary muscle

  K) blind spot

  L) vitreous humor

  M) aqueous humor