1. The Eye
Eye test

2. Cilary
body
Sclera
Cornea
Choroid
Iris
Vitreous
humour
Pupil
Lens
Fovea
Aqueous
humour
Blind
spot
Suspensory
ligament
Optic
Nerve
Retina

3. Generator potential Convergence Vesicle (Rhodopsin) Optic neurone
Intermediate
neurone
Rod
Choroid
Generator
potential
Light
Convergence
Cone
Rhodopsin
Light
ADP + Pi To
Central
Nervous
System
Hyperpolarisation
ATP
Opsin + trans-retinal

4. Light
Optic neurones
Relay neurones
Rods and Cones
Choroid

6. Rods
Cones
120 million per eye
6 million per eye
Not present in fovea
Concentrated mainly in the fovea
Contain only one type of photosensitive pigment, Rhodopsin
Contain one of three types of a photosensitive pigment called iodopsin. (Blue, Red or Green cones)
Convergence: About 100 rods are connected to each optic neurone. This amplifies the weak signal generated by low light intensities but reduces acuity (resolution)
Convergence: In the fovea one Cone is connected to each optic neurone. This gives good visual acuity (resolution) but reduces sensitivity
Slow response to light, stimuli added over time
Fast response to light, can perceive more rapid changes in stimuli
Have more pigment than cones, so can detect less light
Have less pigment than rods, require more light to detect images
Stacks of membrane-enclosed disks are unattached to cell membrane
Disks are attached to outer membrane
Very light sensitive; sensitive to scattered light
Not very light sensitive; sensitive only to direct light
Confer achromatic vision
Confer color vision

7. Fovea
Blind Spot
Rods
Cones

8. Vitreous Humour
Blind Spot
Choroid

9. Optic
neurones
Bipolar
neurones
Fovea
Cones
Choroid

12. 1.
14. 2.
13. 3. 8. 4. 7.
12. 5.
10. 6.
11. 9.