The eye

• what type of organ is the eye ?

  sense organ
• label this eye diagram

  A) suspensory ligament

  B) cornea

  C) iris

  D) pupil

  E) lens

  F) ciliary muscle

  G) sclera

  H) retina

  I) optic nerve

  
• label this diagram

  A) transparent lens that refracts light

  B) controls how much light enters the pupil

  C) transparent disc that can change shape

  D) contains light receptor cells

  E) sensory neurone that carries impulses between eye+brain

  F) hole allowing light to enter eye

  
• what are antagonistic muscles ?

  muscles that work together to acheive movement in 2 directions
• in dark conditions does the pupil dilate or constrict ?

  dilate
• in light conditions does the pupil dilate or constrict ?

  constrict
• why in light conditions does the pupil constrict ?

  to let less light in to not damage the eye
• why in dark conditions does the pupil dilate ?

  To allow more light to enter the eye
• what does accommodation allow ?

  allows the eye to focus on objects that are close or faraway from it
• complete this diagram of a close up object to an eye

  A) contracts

  B) fatter

  C) slacken

  D) more

  E) focus

  
• complete this diagram of a faraway object

  A) relaxes

  B) thinner

  C) contract

  D) less

  E) focus