7/28/2023 0 Comments Retina anatomy diagramThe retina serves a function which is in many ways analogous to that of the film or image sensor in a camera. The optics of the eye create a focused two-dimensional image of the visual world on the retina, which then processes that image within the retina and sends nerve impulses along the optic nerve to the visual cortex to create visual perception. The vitreous humour is a clear, colorless fluid or gel that fills the space between the lens and the retina of your eye.The retina (from Latin: rete "net") is the innermost, light-sensitive layer of tissue of the eye of most vertebrates and some molluscs. These impulses travel along the optic nerve to the brain, where they become the images that we see around us. The retina captures light rays and converts them to electrical impulses. It is filled with two types of photoreceptors, rods, and cones, which work to create central and peripheral vision. The retina is a sensory tissue that lines the back of the eye. The pupil works with the dilator and the sphincter muscles of the iris to change size to let more or less light in. Its size determines the amount of light that will enter the eye. The pupil is the round opening in the center of your eye. The optic nerve is a bundle of more than 1 million nerve fibers that carry visual messages from the retina to the brain. As we grow older, the lens gradually hardens and the ability to accommodate slowly diminishes. ![]() As it focuses, the lens changes shape to adjust for the closeness or distance of the objects through a process called accommodation. As light comes through the pupil, the lens focuses this light onto the retina. The crystalline lens is located just behind the iris. In dim light, dilator muscles will increase the size of the pupil. In bright light, the iris's sphincter muscles tighten and cause the pupil to contract. This iris is embedded with small muscles that dilate and constrict the pupil size based on the amount of available light. The iris is the colored part of your eye that divides the front from the back. The macula is the small, sensitive area of the retina needed for central vision. The center of the macula, where your vision is sharpest. Its function is to keep the eye moist and lubricated. ![]() The conjunctiva is the thin transparent layer of tissue that lines the inner surface of the eyelid that covers the white part of the eye. The cornea then refracts (bends) the rays as they pass through the pupil. As light rays reflect off of objects in the environment, they enter the eyes through the cornea. It covers and protects the iris and plays a vital role in providing clear vision. CorneaĪt the very front of your eye is a transparent, dome-shaped lens called the cornea. The fluid bathes and nourishes the lens and maintains pressure within the eye. The aqueous humor is a clear fluid that fills the space between the lens and cornea (front of the eyeball). It is a light-gathering device that constructs images of the world around you as rays reflect off of objects in the environment and travel through your cornea. The human eye consists of many different and intricate parts, all working together to provide you with sight. They give us valuable information about the world around us, creating images like a highly advanced camera. But do you know how eyes work? Do you know about common vision problems that can affect you and your loved ones? We think of them as windows to the soul and spend plenty of time staring into the eyes of people we love. The eyes are the first thing many of us notice when we meet someone new.
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