Complete the following:
- What is meant by 20/70 vision? ______________________
- What is meant by 20/10 vision? ______________________
- What visual problem is created by astigmatism? ______________________
- Why does the near point of accommodation often increase with age? ______________________
- Describe the eye defect that causes color-deficient vision. ______________________
a)
To determine:
The meaning of 20/70 vision.
Introduction:
The eyes are the main organ of the visual system. They are responsible for providing the animals with vision as they have receptors to receive and sense visual information. Eyes collect light in the form of wavelength and then convert it into electro-chemical impulses.
Explanation of Solution
The visual acuity, sharpness of vision, is determined by the measuring the ratio of vision by standing 20 feet apart from the given object. 20/70 vision means that the person must be at 20 feet to see the object for which a normal vision person must be 70 feet apart.
20/70 vision means that a person should be 20 feet apart to see the object to which a normal vision person can see 70 feet apart.
b)
To determine:
The meaning of 20/10 vision.
Introduction:
The eyes are the main organ of the visual system. They are responsible for providing the animals with vision as they have receptors to receive and sense visual information. Eyes collect light in the form of wavelength and then convert it into electro-chemical impulses.
Explanation of Solution
The visual acuity, sharpness of vision, is determined by the measuring the ratio of vision by standing 20 feet apart from the given object. 20/10 vision means that the person must be at 20 feet to see the object for which a normal vision person must be 10 feet apart. This means the eyesight of the person fat better than that of the normal human being.
20/70 vision means that a person should be 20 feet apart to see the object to which a normal vision person can see 10 feet apart.
c)
To determine:
The problem caused by astigmatism.
Introduction:
The eyes are the main organ of the visual system. They are responsible for providing the animals with vision as they have receptors to receive and sense visual information. Eyes collect light in the form of wavelength and then convert it into electro-chemical impulses.
Explanation of Solution
Any fault in the shape of cornea leads to astigmatism. A person suffering from astigmatism, has irregular shaped cornea. Due to this light refracts in an altered manner to the retina. This leads to fuzzy, blurry, and distorted vision.
Astigmatism leads to blurred and distorted vision.
d)
To determine:
The near point accommodation often increases with age.
Introduction:
The eyes are the main organ of the visual system. They are responsible for providing the animals with vision as they have receptors to receive and sense visual information. Eyes collect light in the form of wavelength and then convert it into electro-chemical impulses.
Explanation of Solution
With age, the lens of the eyes become hard that reduces the ability of eye to accommodate. As the lens hardens it becomes more spherical leading to increase in refractive power to focus on near objects. This condition is called presbyopia, that causes decrease in the near point of vision.
The near point accommodation often increases with age because with age the lens gets hardened.
e)
To determine:
The eye defect that causes color-deficient vision.
Introduction:
The eyes are the main organ of the visual system. They are responsible for providing the animals with vision as they have receptors to receive and sense visual information. Eyes collect light in the form of wavelength and then convert it into electro-chemical impulses.
Explanation of Solution
The color-deficient vision means that the person is color blind, the condition termed as achromatopsia. Such people can see only grey, black or white colors. If color blindness is inherited then it affects only one eye and if it is caused by injury then it affects one eye only.
The eye defect that causes color-deficient vision is the color blindness.
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