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The Visual System: How Your Eyes Work Video Lecture | General Awareness for SSC CGL
FAQs on The Visual System: How Your Eyes Work Video Lecture - General Awareness for SSC CGL
| 1. What are the main components of the human eye and their functions? |  |
Ans.The main components of the human eye include the cornea, lens, retina, and optic nerve. The cornea is the transparent front layer that refracts light. The lens focuses light onto the retina, which contains photoreceptor cells (rods and cones) that convert light into electrical signals. These signals are then transmitted to the brain via the optic nerve, where they are processed into images.
| 2. How does the eye adjust to different lighting conditions? | |
Ans.The eye adjusts to different lighting conditions through a process called pupillary reflex. In bright light, the iris constricts the pupil to reduce the amount of light entering the eye. In dim light, the iris dilates the pupil to allow more light in. Additionally, photoreceptors in the retina adapt to changes in light intensity, enhancing vision in varying conditions.
| 3. What is the role of rods and cones in vision? | |
Ans.Rods and cones are the two types of photoreceptors in the retina. Rods are responsible for vision in low light conditions and are highly sensitive to light but do not detect color. Cones, on the other hand, function well in bright light and are responsible for color vision, with three types corresponding to red, green, and blue light. Together, they enable us to see in a range of lighting conditions and perceive color.
| 4. What is the significance of the fovea in visual acuity? | |
Ans.The fovea is a small pit in the retina that is responsible for sharp central vision. It contains a high concentration of cones, allowing for the highest visual acuity and color perception. When we focus on an object, light from that object is directed onto the fovea, enabling us to see fine details clearly.
| 5. How do common visual impairments, like myopia and hyperopia, affect vision? | |
Ans.Mybopia, or nearsightedness, occurs when light entering the eye is focused in front of the retina, making distant objects appear blurry. Hyperopia, or farsightedness, happens when light is focused behind the retina, causing nearby objects to be out of focus. Both conditions can often be corrected with glasses, contact lenses, or refractive surgery.
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Oct 18, 2025
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