Cow Eye Dissection Lab Report

As seen in the cow eye dissections, the eye is one of the most complex organ in an organism. This small organ has multiple structures and tissues that work together to provide the organism with vision. The journey of the image formation begins at the Cornea, the outermost layer of the eye. Usually, this structure is transparent like water, but in this experiment, due to the chemicals used to preserve the eye , the cornea appeared opaque. Its transparency is what allows light to easily pass through it while still refracting light. Its ability to refract allow light to enter directly into the eye so the image will focus clearly. Also, it protects the eye and has the ability to heal itself in case of an accident. Once the light passes the cornea,
When it is a darker setting, the pupil dilate to allow more light to pass through. Whereas, when it is brighter setting, the pupil contracts to prevent too much light from entering. After the light passes the pupil and iris, it comes in contact with the lens. As mentioned earlier, due to to the nature of the preservative chemicals, the lens appeared orange and hard, However, the animal lenses are clear, soft, convex lens and it has the ability to converges the light rays and create an image on the retina. A ring of muscles called the ciliary muscle allows it to change its focal length so it can focus on objects at different distances. For example, if the object is far, the lens will have a shorter focal length. Whereas if the object is closer, the lens will have a longer focal length. After, the image is then focused on the retina, clear structure that acts like a screen to catch clear images. Once the light ray come in contact with the retina, the rays begin to stimulates the photoreceptors, cells on the retina. As stated previously, the retina was a cream colour and was a result of the chemicals. Photoreceptors included Rod cells that detect shapes and Cone cells detect
Humans don’t have it which is why we find it harder to see at night. From the experiment, one of the obvious factors observed was that the eye contains a lot of fluids. One of the fluids is called Aqueous humour. It is mostly located between the cornea and the iris and pupil. This fluid helps maintain the shape of the eye as well as refract the light. Another liquidy substances in the eye is the vitreous humour. Unlike the aqueous humour, the vitreous humour is a jelly like substance. This jelly substance is clear, and it helps maintain the shape of the eye. It is located behind the lens and in front of the retina. It also helps keep the retina pressed against the choroid.Although the brain is not part of the eye, it plays a big role in the image formation. All these structure are then contained in another structure called the sclera. The sclera protects the interior of the eye. It is attached to muscles that help the eye move around. This is then covered with fat, so that the fat can protect the eye from injuries. It acts like a shock absorbe. Lastly, as learned in class, lenses create inverted images. Therefore the image formed on the retina is