| Front | Process of light entering the eye |
|---|---|
| Back | Light enters the eye and hits the photoreceptors and is absorbed by light-sensitive optical pigments Light bleaches pigments, causing a chemical change and altering the membrane permeability to sodium ions A generator potential is created and if it reaches a threshold, a nerve impulse is sent along the bipolar neurone Bipolar neurones connect photoreceptors to optic nerve which takes impulses to the brain |
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