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Base Curve of contact Lens

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The base curve of a contact lens refers to the curvature of the back surface of the lens. It is measured in millimeters and is one of the main characteristics of a contact lens. The base curve is important because it determines how well the lens will fit on the eye. A lens with a base curve that is too flat may not conform to the shape of the eye and may cause discomfort or irritation. On the other hand, a lens with a base curve that is too steep may be difficult to insert and remove and may cause lens dislocation or other problems. To find the right base curve for a contact lens, an optometrist will measure the curvature of the eye using a tool called a keratometer. This instrument measures the curvature of the front surface of the eye (the cornea) and helps the optometrist determine the appropriate base curve for the lens. In addition to the base curve, other factors that can affect the fit and comfort of a contact lens include the diameter of the lens and the material o
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Physiology of Optic Disc

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The optic disc, also known as the optic nerve head, is the point at which the optic nerve fibers leave the eye and enter the brain. The physiology of the optic disc is critical in understanding the normal functioning of the visual system and the causes and effects of eye diseases. Function of the Optic Disc The main function of the optic disc is to transmit visual information from the retina to the brain. The retina is the light-sensitive layer of tissue at the back of the eye that converts light into electrical signals. These electrical signals are then transmitted to the brain via the optic nerve. The optic disc is where the optic nerve fibers converge to form the optic nerve. The optic disc also plays an important role in maintaining the health of the retina. The blood vessels that supply the retina with blood and oxygen enter and exit the eye through the optic disc. The optic disc also contains a small number of retinal pigment epithelial cells that help to protect and support the
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Mosquito eyes

 Mosquitoes, like many other insects, have compound eyes. Compound eyes are made up of numerous individual photoreceptor units called ommatidia. Each ommatidium consists of a lens, a cornea, a crystalline cone, and a light-sensitive receptor cell.  Mosquito compound eyes are typically large in proportion to their body size and are positioned on the sides of their head. They have a spherical shape and provide mosquitoes with a wide field of vision, allowing them to detect movement in different directions.  The compound eyes of mosquitoes are designed primarily for detecting changes in light intensity and movement rather than forming detailed images. Each ommatidium captures a small part of the overall image, and the mosquito's brain processes the input from multiple ommatidia to form a composite picture of its surroundings. Mosquitoes are attracted to certain stimuli such as heat, carbon dioxide, and chemicals in human sweat, which help them locate potential hosts for blood meals. T
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