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12 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Two concrens of Visual Impairment |
1. Low vision 2. Blindness |
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Two aspects of VI |
1. Peripheral vision 2. Visual Acuity |
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Describe Peripheral vision |
We can see our surroundings of 180° what you can see to each side or up and down without moving your head, or everything that you can see that isn't in your central vision. |
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Visual Acuity |
It is ability of the eye to see and recognise the details of the object what we see |
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What is 20/20 vision |
It is a term used for normal visual acuity In which we can see the clarity of an object which is placed in the distance of 20 feet |
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20/100 vision |
In this term a person can only see the object clearly from the distance of 20 feet and cannot clearly see the objects placed beyond that |
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What is the chart used to measure our vision by doctors called |
Snellen chart |
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Describe low vision |
Low vision people are partially sighted. It can't be corrected with glasses, contacts or surgery. It is not blindness as sight is limited. Causes: due to diabetes, glaucoma or age related issues |
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Describe blindness |
Blindness is a lack of vision. It can not be corrected with glasses or lenses There are 2 types:- Partial blindness: very limited vision Complete blindness: cannot see anything |
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2 errors of eye? |
1. Refractive errors 2. Converging errors |
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Refractive errors |
Hard to see clearly Problem of light and vision Image does not fall on retina because of cornea shape or eyeball length 3 types of refractive errors: 1. Myopia (near sightedness) 2. Hyperopia (far sightedness) 3. Astigmatism (blurry vision) |
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Convergence errors |
Eyes are not in correct position 3 types: 1. Strabismus 2. Amblyopia 3. Nystagmus |
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