The Eye (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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Practise the cards
15 cards from this deck
Accommodation
Accommodation
Eye changing shape to focus on near/distant objects
Retina
Retina
Layer of light sensitive cells at back of eye
Optic nerve
Optic nerve
Carries impulses from retina to brain
Sclera
Sclera
White outer layer supporting eye structures
Cornea
Cornea
See-through layer that bends & focuses light onto retina
Iris action in bright light
Iris action in bright light
Circular contract, radial relax, pupil smaller
Iris action in dim light
Iris action in dim light
Circular relax, radial contract, pupil larger
Ciliary muscles for near object
Ciliary muscles for near object
Contract
Lens shape for near object
Lens shape for near object
Thicker and more curved
Ciliary muscles for distant object
Ciliary muscles for distant object
Relax
Lens shape for distant object
Lens shape for distant object
Thinner
Myopia
Myopia
Short sightedness
Cause of myopia
Cause of myopia
Lens too curved
Hyperopia
Hyperopia
Long sightedness
Cause of hyperopia
Cause of hyperopia
Lens too flat