Label the eye
What is the function of the Cornea?
Modify and admit light
What is the function the cilary muscle and Suspension fibers?
Changes lens thickness and secretes aqueous fluid
What is the function of the iris?
Adjust papillary disameter
What is the function of the Aqueous and Vitreous humor?
They both maintain the shape of the eyeball
What is the function of the lens?
What is the function of the retina?
What is the function of the macula?
An oval yellowish area surrounding the fovea near the centre of the retina in the eye, which is the region of keenest vision.
What is the function of the optic nerve?
Relays signal from retina to the CNS
What are the 3 types of cells found in the retina?
Cones - Detects colour
Rods - Detects light
Biopolar cells - Connects rods and cones to ganglion
What angle does light enter the eye if an object is far away, and what happens to the lens?
The light rays are parallel. The lens is flat and thin. Cilary muscle is relaxed therefore suspension filaments are taut.
What does refraction mean?
The bending of light
What nervous system is responsible for visualising distant objects?
What nervous system is responsible for near objects?
Para Sympathetic. Contraction of the Cilary muscle
What is near response?
The responses to a near sighted object. Lens thickening, pupils contracting and the eyes crossing slightly.
What is edge effect?
Constriction of the iris occurs to prevent this in near response. It is where the lens is less effective at bending light around the edge of the lense, so the pupil dilates to cancel out this area.
What layer of the eye supplies blood supply?
Chorid layer. Middle layer.
What area of the eye causes the blind spot?
The optic disk
How many Cones and the Rods attach to one ganglion?
Cones = 1
Rods = many
What are the 3 different colours of cones?
Blue, Green and Red
What is the name given to the area where the optic nerve crosses over?
What is the name of the pigment in Rods?
Rhodopsin - which is further broken down to 'Opsin' and 'retinal'