![]() ![]() VITREOUS HUMORĬlear gel behind the lens which fills the rear 2/3 of the eyeball (aqueous humor fills the anterior 1/3) and helps keep the retina attached. In cats and dogs, the nictitating membrane is not usually visible, and its appearance is often a sign of poor health or a painful eye. It is often called a third eyelid or haw. The Nictitating Membrane is a thin piece of tissue, supported by cartilage, which moves across the eyeball like a windshield wiper, to give the cornea additional protection. During cataract surgery the anterior lens capsule is partially opened so that the abnormal lens material can be removed. LENS CAPSULEĪ cellophane-like covering of the lens (only much thinner). A pet may rub or scratch their eye when inflammation is present. Irritation, redness, swelling of any tissue. CATARACTĪn opacification (cloudiness) of the normally clear lens. The lens helps to bring rays of light to a focus on the retina. It is suspended behind the iris by hundreds of microscopic fibers. LENSĬlear and as thick as a stack of 5 dimes. Inflammation of the uvea, which can be anterior or posterior. This includes the iris, ciliary body and choroid. The pupil gets smaller in bright light, larger in dim light conditions. Glaucoma occurs when the drainage angle is blocked with inflammatory debris, or if the drainage angle is abnormally formed from birth, or of the normal flow of fluid inside the eye is blocked in some other way (by a tumor for example). GLAUCOMAĮlevated intraocular pressure that usually causes pain and vision loss. The aqueous humor is produced in the ciliary body and drains, via the angle, out of the eye into the bloodstream. The eye contains a clear fluid called aqueous humor. AQUEOUS HUMORĬlear fluid inside the eye, which provides nutrition for the lens and cornea. The iris controls the amount of light that enters the eye, by varying the size of the pupil opening. ![]() CORNEAL ULCERĪn erosion or scrape of the cornea in which some of the epithelium is lost. It is covered with a transparent epithelial (or skin) layer. You may wish to generate a quiz to go along with the parts of the eye and how a dissection should take place.The clear front part of the eye that covers the iris, pupil and anterior chamber. Once they are finished, collect the worksheets.Įvaluate the worksheets based on your own grading scale.There are also questions for the students to answer as they watch the video. While watching the video, the students are expected to write down the procedure of a cow's eye dissection.If you do not, make sure that the students have headphones for the computer lab so that the videos are not all running at the same time. If you have a TV/Computer connection in your classroom, the students can watch the video as a whole. You will probably want to leave this for Day 2. ![]() The second part of this activity, students will watch the video on a cow eye dissection.The students will then write a summary on how light travels through the eye.Student will click on the diagram of the eye and record the definitions that are on the worksheet.Once the students have been given the worksheets, they can go to the Cow's Eye Dissection website. Give each student a copy of the Cow's Eye Dissection worksheet.Headphones (if you are watching the video in the computer lab).understand the process of a dissection and why it can be useful in learning about body parts.learn about the different parts of the eyes.Website(s)Įxploratorium - Cow's Eye Dissection Content Provider You can use this in your classroom as a replacement from an actual dissection, or as a warm-up before and actual dissection. This Web site shows photos and videos of a dissection. At the Exploratorium, we dissect cows' eyes to show people how an eye works. ![]()
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