Human Anatomy And Physiology Lab - Essay Example

Report Blind spot Method: An eye is tested at a time, with the other covered staring at a chart with an ant and a plus sign present on it. The right eye is focused on the plus sign. The paper is moved closer consequently the ant will disappear, the same s done with the other eye but instead of staring at the plus sign, the ant was the focus of the attention. Results: At a specific distance, about 40cm while staring at the plus sign using the right eye, the ant disappeared to appear later at a closer prospect.

The same happened with the left eye Conclusion: The alternate object not being the focus of the eye disappears because it becomes the focus of the optic disc of the retina. 2. Near point Determination Method: Using the T on the page, the page is moved towards the eye till the letter becomes blurred one eye at a time, then it is moved away till it becomes focused again. Results: the right eye refocused at about 9 cm, while the left eye at about 10.5 cm Conclusion: 3. Visual Acuity Method: Using a Snellen eye chart, each eye is tested separately with an eye covered at a time by standing about 20 meters away from the chart.

Results: The right eye could read everything supposed to be read at that distance, so did the left eye, i.e. 20/20 vision of both eyes was detected. Conclusion: no aberrations of the lens or cornea was present to interfere with the angle of pinpoints of light that reaches the retina 4. Astigmatism Method: An astigmatism chart was used to test each eye alternatively, covering the untested eye, to test for unevenness of curvature. Results: Both eyes saw the radiating lines at even intensity of blackness.

Conclusion: since all lines were sharp and of even intensity no astigmatism was present