12111484
Description
Flashcards by Noah Cliff, updated more than 1 year ago
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Created by Noah Cliff
about 6 years ago
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| Question | Answer |
| Identify the main parts of the eye | The retina The lense The Corena The Pupil The Optic nerve The Iris |
| How has the Iris adapted to their function? | The Iris can constrict or dilate to change the amount of light entering the eye. |
| How has the Cornea adapted to their function? | The cornea refracts the light that enters through the pupil together. |
| How has the Lens adapted to their function? | The lens receives the light rays from the cornea it fine tunes the light using the Ciliary Muscles (which makes the lens fatter or thinner for far/near objects) |
| How has the Retina adapted to their function? | The retina has layers of Rods and cones The Rods- They detect difference in light intensity The Cones- They are the receptors that detect different colours (some cones see red and some see green and blue) |
| Why are some people Shortsighted? | Shortsightedness could be due to the eyeball being too long or the cornea being too curved both resulting in the light rays from far away distances not hitting the retina. |
| Why are some people Longsighted? | This is the opposite of Shortsightedness as the eyeball is either too short or the Cornea is too flat. |
| How are people colour blind? | People with colourblindness have defective cones in their retina that do not work. |
| Define Cataract | A build-up of protein in the lens that makes it cloudy resulting in faulty vision |
| How does one remove a cataract? | The clouded lens could be replaced with an artificial plastic lens. |
| How can Short/Longsightedness be cured? | 1. The first solution is to wear glasses or contact lenses to refract the light before it enters the eye. a- for shortsightedness divergent lenses b- for longsighted converging lenses 2. A more perminant solution is to undergo laser surgery where a laser cuts away at the cornea and reshape it. |
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