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eye - Coggle Diagram
eye
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focusing
far objects:
-cilliary muscles relax, pulling on suspensory ligaments
-suspensory ligaments become taut, pulling on the edges of the lens
-lens become flatter and less convex to refract the light rays slightly
-image is sharply focused on retina
-photorecepters are stimulated and transmits nerve impulses to the brain and interprets the nerve impulses, allowing the person to see the distant objects
near objects:
-cilliary muscles contract, relaxing their pull on suspensory ligaments
-suspensory ligaments become slacken, relaxing their pull on the edges of the lens
-lens become thicker and more convex to refract the light rays slightly
-image is sharply focused on retina
-photorecepters are stimulated and transmits nerve impulses to the brain and interprets the nerve impulses, allowing the person to see the close objects
reflex arc
-light intensity entering changes
-photoreceptors in the retina are stimulated and transmits nerve impulses across a synapse to the relay neurone in the brain and then across another synapse to the motor neurone
-motor neurone transmits nerve impulses to iris muscles
-iris muscles contract