Light stimulates photoreceptors, bleaching pigments and altering membrane permeability to generate impulses that travel via bipolar neurons through the optic nerve to the brain.
Light hitting photoreceptors causes pigments to bleach, altering membrane permeability, generating a potential, and sending impulses via bipolar neurons to the optic nerve and brain.
| 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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