This page features a parts of the eye diagram with a printable worksheet to go with. Students will learn how to label the parts of a human eye by dragging and dropping labels in the correct position. It is an online game worksheet that can be played for free and repeated until students catch this challenging biology skill. The eye functions almost like a camera. Like a camera, the eye has a lens that it uses to focus on objects. For objects to be seen, some form of life has to shine on them. When light shines on them, we capture the rays from the light through the lens onto the retina where an image is built. The eye also have optical nerves that transmit the images in sees to the brain for interpretation. The eye diagram is a fun anatomy lesson children will love. This exercise is for students in 1st, 2nd, 3rd, 4th, 5th, 6th and 7th grades.
Here is more information about the parts of the eye and their functions:
Cornea: The cornea is the clear, dome-shaped surface that covers the front of the eye. It is made up of several layers of tissue and is responsible for about two-thirds of the eye's total focusing power. The cornea works in conjunction with the lens to focus light onto the retina. It also helps to protect the eye by acting as a barrier against dirt, germs, and other foreign substances.
Iris: The iris is the colored part of the eye that surrounds the pupil. It is made up of muscle fibers that can contract or relax to adjust the size of the pupil in response to different levels of light. The color of the iris is determined by the amount and type of pigment cells it contains.
Pupil: The pupil is the small, circular opening in the center of the iris that allows light to enter the eye. It is surrounded by the iris and is responsible for controlling the amount of light that enters the eye. When the pupil is large, more light is allowed to enter the eye, which is necessary in low light conditions. When the pupil is small, less light is allowed to enter the eye, which helps to reduce glare and protect the retina from damage.
Lens: The lens is a transparent, elastic structure located behind the pupil that helps to focus light onto the retina. It is made up of proteins called crystallins and is suspended in place by a network of fibers called the zonules. The lens can change shape in order to focus light from objects at different distances. This process, known as accommodation, is controlled by the ciliary muscles.
Retina: The retina is the light-sensitive tissue lining the back of the eye that converts light into electrical signals. It is made up of several layers of cells, including photoreceptors, bipolar cells, ganglion cells, and horizontal cells. The photoreceptors, called rods and cones, are responsible for converting light into electrical signals. The bipolar cells and horizontal cells help to process and transmit the signals to the ganglion cells, which send the signals to the brain via the optic nerve.
Optic nerve: The optic nerve is a bundle of nerve fibers that carries the electrical signals from the retina to the brain. It is made up of ganglion cell axons and is located at the back of the eye. The optic nerve is responsible for transmitting visual information from the eye to the brain, where it is interpreted and perceived as sight.
Sclera: The sclera is the white, outer layer of the eye that helps to protect and support the eye. It is a tough, fibrous tissue that encases the entire eye and provides structural support to the eye. The sclera also helps to maintain the shape of the eye and protect it from injury.
Conjunctiva: The conjunctiva is the thin, transparent membrane that covers the white part of the eye and the inner surface of the eyelids. It helps to keep the eye moist and protect it from infection by producing a small amount of lubricating fluid.
Tear ducts: The tear ducts are small tubes located in the corners of the eye that produce and drain tears. Tears are produced by the lacrimal glands, which are located above the outer corner of each eye. The tears drain into the tear ducts and then into the nasal cavity, where they are absorbed.
Eyelids: The eyelids are folds of skin that cover and protect the eye. They consist of the upper eyel