A Level Exam > A Level Videos > Biology A-Level > The Eye: Parts & Mechanism of Vision
The Eye: Parts & Mechanism of Vision Video Lecture | Biology A-Level - A Level
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FAQs on The Eye: Parts & Mechanism of Vision Video Lecture - Biology A-Level - A Level
| 1. What are the different parts of the eye involved in the mechanism of vision? |  |
Ans. The different parts of the eye involved in the mechanism of vision are the cornea, iris, lens, retina, and optic nerve. The cornea acts as a protective outer layer and helps in focusing light onto the retina. The iris controls the size of the pupil, regulating the amount of light that enters the eye. The lens further focuses the light onto the retina. The retina contains photoreceptor cells that convert light into electrical signals. Finally, the optic nerve transmits these signals from the retina to the brain for interpretation.
| 2. How does the cornea contribute to vision? | |
Ans. The cornea plays a vital role in vision as it acts as the eye's outermost lens. It helps in focusing light onto the retina, which is crucial for clear vision. The cornea refracts or bends the incoming light, allowing it to pass through the pupil and reach the lens. It also serves as a protective layer, shielding the delicate structures within the eye from damage and foreign particles.
| 3. What is the function of the retina in the mechanism of vision? | |
Ans. The retina is a thin layer of tissue located at the back of the eye. It contains specialized photoreceptor cells called rods and cones. These cells convert incoming light into electrical signals, which are then transmitted to the brain via the optic nerve. The retina plays a crucial role in the formation of visual images, as it captures and processes visual information before sending it to the brain for interpretation.
| 4. How does the optic nerve contribute to the mechanism of vision? | |
Ans. The optic nerve is responsible for transmitting visual information from the retina to the brain. It carries electrical signals generated by the photoreceptor cells in the retina and delivers them to the visual cortex in the brain for interpretation. The optic nerve is essential for the formation of visual perception, as it allows the brain to receive and process the electrical signals into meaningful visual images.
| 5. What is the role of the lens in the mechanism of vision? | |
Ans. The lens of the eye plays a crucial role in focusing incoming light onto the retina. It is a transparent structure located behind the iris. When light enters the eye, the lens changes its shape to adjust the focus and ensure that the image formed on the retina is clear and sharp. This process, known as accommodation, allows us to see objects at different distances by adjusting the curvature of the lens. Without the lens, the incoming light would not be properly focused, leading to blurry vision.
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Nov 21, 2024 Last updated |
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