1. Give three observations you made when you examined the surface of the eye.
When examining the surface of the eye, I observed the fatty tissue that surrounded the eyeball, the cornea which was black and opaque and finally the sclera which was continuous with the cornea.
2. What is the black part in the middle of the iris?
The black hole located in the centre of the iris is the pupil.
3. What did you observe when you looked at the newspaper through the lense?
Initially when looking through the lense it was opaque, this was until pressure was applied and the shape changed. Under this change the lense became transparent and I was able to read the newspaper through it.
4. What did the retina look like? Could you find the optic nerve?
The retina appeared slightly white against the choroid coat. The optic nerve was not visible in our dissection and could only be seen in the fatty tissue at the back.
5. Find out more about one of the parts of the eye that you have observed, such as its function, related diseases or surgery.
An eyelid is a thin fold of skin that covers and protects the human eye. The eyelid muscles retract and contract the eyelid to "open" and "close" the eye.
The eyelid surgeries are called blepharoplasties and are performed mostly to alter one's facial appearance.
Most of the cosmetic eyelid surgeries are aimed to enhance the look of the face and to boost self-confidence by restoring a youthful eyelid appearance. They are intended to remove fat and excess skin that may be found on the eyelids after aging
By dissecting the eye of a cow, which is similair to the eyes of all mammals, including humans, we aimed to gain an understanding of the structure and function of the parts of the eye.
Newspaper, cow eye, dissecting board, dissecting kit, safety glasses, lab coats and gloves.
- Obtain a cow eye, place it in you dss voting pan and rinse the eye with water
- Rotate the eye until the larger bulge is on top of the eye. The eye is now in position it would be in a body.
- Using your scalpel, cut across the surface of the cornea, at this stage the aqueous humour will ooze out.
- Pierce the white part of the sclera. Make a hole large enough for your scissors to fit through. Carefully cut around the eye using the edge of the cornea as a guide. Lift the eye and turn it as needed to make the cut.
- Remove the front of the eye
- Locate internal structures and record.
Results and conclusion
Throughout the entire dissection we located a total of 11 different parts of the eye and their functions
This began with the external structures which includes the fatty tissue, optic nerve, sclera cornea and muscles.
As we further dissected the eye we uncovered the internal structures, this allowe us to have a deeper understanding of the functions of the eye and how they connected. We observed the aqueous humour which was a fluid that runs out when the eye is cut, the iris which was black tissue of the eye that contains curved muscle fingers
, the lens which can be seen through the pupil, the vitreous humor which was a fluid inside the back cavity of the eye behind the lense
and finally the retina which was tissue I'm the back if the eye, where light is focused.
This prac allowed us to develop a deeper understanding of the eye and its functions through a hands on experience. A huge factor of this was seeing the actual retina and the blind spot through Its connection with the optic nerve.