The Human Eye And Colourful World Quiz
Questions and Answers
- 1.
The term “accommodation” as applied to the eye, refers to its ability to:
- A.
Control the light intensity falling on the retina
- B.
Erect the inverted image formed on the retina
- C.
Vary the focal length of the lens
- D.
Vary the distance between the lens and retina
Correct Answer
C. Vary the focal length of the lensExplanation
The term "accommodation" refers to the eye's ability to adjust the focal length of the lens. This adjustment allows the eye to focus on objects at different distances. When the eye focuses on a nearby object, the lens becomes more curved, increasing its focal length. Conversely, when the eye focuses on a distant object, the lens becomes flatter, reducing its focal length. This ability to vary the focal length of the lens enables the eye to create clear images on the retina, regardless of the object's distance from the eye.Rate this question:
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- 2.
A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called:
- A.
Cataract
- B.
Hyperopia or Farsightedness
- C.
Myopia or Nearsightedness
- D.
Accomodation
Correct Answer
C. Myopia or NearsightednessExplanation
Myopia or nearsightedness is the correct answer because it is a defect of vision where a person can see nearby objects clearly but has difficulty seeing distant objects clearly. In myopia, the eyeball is longer than normal or the cornea is too curved, causing light to focus in front of the retina instead of directly on it. This results in blurred vision for distant objects.Rate this question:
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- 3.
Figure a, b, c respectively; indicate the point in case of:
- A.
The farsighted eye, the nearsighted eye and normal eye
- B.
The normal eye, the nearsighted eye and farsighted eye
- C.
The normal eye, the farsighted eye and nearsighted eye
- D.
The nearsighted eye, the normal eye and farsighted eye
Correct Answer
C. The normal eye, the farsighted eye and nearsighted eyeExplanation
The correct answer is "The normal eye, the farsighted eye and nearsighted eye." This is because the order of the figures corresponds to the order of the eye conditions mentioned. The first figure represents the normal eye, the second figure represents the farsighted eye, and the third figure represents the nearsighted eye.Rate this question:
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- 4.
The tiny spot in the center of the retina where visual sharpness if greatest
- A.
Pupil
- B.
Rods and cones
- C.
Fovea
- D.
Blind spot
Correct Answer
C. FoveaExplanation
The fovea is a small area in the center of the retina that contains a high concentration of cones, which are responsible for color vision and visual acuity. The fovea is the region of the retina where visual sharpness is greatest, allowing for detailed and clear vision. This is because the fovea has a higher density of cones compared to other parts of the retina, allowing for better resolution and clarity of images.Rate this question:
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- 5.
This focuses the light falling on the retina:
- A.
Fovea
- B.
Pupil
- C.
Iris
- D.
Lens
Correct Answer
D. LensExplanation
The lens of the eye is responsible for focusing the light that enters the eye onto the retina. The lens is able to change shape to adjust the focus and ensure that the light rays converge onto the retina, which is located at the back of the eye. This process allows for clear and sharp vision. The fovea, pupil, and iris have other functions in the eye, but they do not directly focus the light onto the retina.Rate this question:
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- 6.
The muscles that contracts or dilates to allow more or less light into the eye:
- A.
Iris
- B.
Pupil
- C.
Lens
- D.
Retina
Correct Answer
A. IrisExplanation
The iris is the correct answer because it is the part of the eye that contracts or dilates to control the size of the pupil. When the iris contracts, the pupil becomes smaller, allowing less light to enter the eye. Conversely, when the iris dilates, the pupil becomes larger, allowing more light to enter the eye. The iris acts like a camera aperture, adjusting the amount of light that reaches the retina at the back of the eye.Rate this question:
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- 7.
The protective clear layer on the eyeball
- A.
Cornea
- B.
Pupil
- C.
Iris
- D.
Lens
Correct Answer
A. CorneaExplanation
The cornea is the transparent, protective layer that covers the front part of the eyeball. It acts as a barrier against dust, germs, and other foreign objects, preventing them from entering the eye and causing damage. The cornea also helps to focus light as it enters the eye, contributing to clear vision. It is a vital component of the eye's structure and function, making it the correct answer in this context.Rate this question:
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- 8.
The hole in the center of they eye through which light can pass
- A.
Iris
- B.
Cornea
- C.
Fovea
- D.
Pupil
Correct Answer
D. PupilExplanation
The pupil is the correct answer because it is the hole in the center of the eye that allows light to pass through. It is located in the center of the iris, which is the colored part of the eye. The size of the pupil can change in response to different lighting conditions, with it becoming smaller in bright light and larger in dim light.Rate this question:
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- 9.
A term used to describe the sharpness of someone's vision
- A.
Acuity
- B.
Fovicity
- C.
Blindspot
- D.
Fungibility
Correct Answer
A. AcuityExplanation
Acuity is the correct answer because it refers to the sharpness of someone's vision. It is a term commonly used in optometry to describe how well a person can see and distinguish details. Acuity is measured using an eye chart, and it is an important factor in determining the need for corrective lenses.Rate this question:
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- 10.
This passes neural messages onto the brain
- A.
Blindspot
- B.
Optic nerve
- C.
Pupil
- D.
Retina
Correct Answer
B. Optic nerveExplanation
The optic nerve is responsible for transmitting neural messages from the retina to the brain. It carries visual information such as light, colors, and shapes to the brain, allowing us to see and interpret our surroundings. The retina, on the other hand, is the part of the eye that receives and processes the light, while the blind spot refers to the area on the retina where the optic nerve exits and lacks photoreceptor cells. The pupil is the opening in the center of the iris that regulates the amount of light entering the eye.Rate this question:
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- 11.
The conversion of one stimulus to another type of energy is called:
- A.
Acuity
- B.
Fovicity
- C.
Transduction
- D.
Myopia
Correct Answer
C. TransductionExplanation
Transduction refers to the process of converting one form of energy into another form. In the context of the question, it specifically refers to the conversion of one stimulus into another type of energy. Acuity, fovicity, and myopia are not related to the conversion of energy and are therefore incorrect options.Rate this question:
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- 12.
The part of the retina which contains no photoreceptor cells
- A.
Fovea
- B.
Blindspot
- C.
Lens
- D.
Optic nerve
Correct Answer
B. BlindspotExplanation
The blind spot is the correct answer because it is the part of the retina that contains no photoreceptor cells. Photoreceptor cells, such as rods and cones, are responsible for detecting light and transmitting visual information to the brain. The blind spot, also known as the optic disc, is the area where the optic nerve exits the eye, and there are no photoreceptor cells present in this region. Therefore, it is unable to detect light and contribute to vision.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Aug 08, 2018Quiz Created by
Kim Graver
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