The Eye (AQA GCSE Biology): Flashcards
📚Flashcards
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15 cards from this deck
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Practise the cards
15 cards from this deck
Accommodation
Accommodation
Lens changing shape to focus on near/distant objects
Retina function
Retina function
Light sensitive cells that send impulses when stimulated
Optic nerve role
Optic nerve role
Carries impulses from retina to brain
Cornea function
Cornea function
See-through layer that bends & focuses light onto retina
Pupil size in bright light
Pupil size in bright light
Smaller (circular muscles contract, radial relax)
Pupil size in dim light
Pupil size in dim light
Larger (circular relax, radial contract)
Ciliary muscles for near objects
Ciliary muscles for near objects
Contract (suspensory ligaments loosen)
Lens shape for near objects
Lens shape for near objects
Thicker and more curved
Ciliary muscles for distant objects
Ciliary muscles for distant objects
Relax (suspensory ligaments tighten)
Lens shape for distant objects
Lens shape for distant objects
Thinner
Myopia (short sightedness)
Myopia (short sightedness)
Lens too curved, distant objects appear blurry
Hyperopia (long sightedness)
Hyperopia (long sightedness)
Lens too flat, cannot refract light enough
Lens type for myopia treatment
Lens type for myopia treatment
Concave lenses (spread out light)
Lens type for hyperopia treatment
Lens type for hyperopia treatment
Convex lenses (bring rays together)
Laser surgery for myopia
Laser surgery for myopia
Reduces cornea thickness (refracts light less)