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Midterm

Sensation and Perception Midterm 1 Lecture Notes

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Department
Psychology
Course
PSYC 2390
Professor
Lana Trick
Semester
Winter

Description
Sensation and Perception Lecture Notes Introduction to Vision B. Pupil/ Iris 2. Disorders/problems a. Reduction of pupil size with age depth field  It develops layers with age, but it does not have a lot of room to grow. This causes the cells to be squished together. b. Albinism (Iris): has melanin that gives colour to the iris, It has to do with your skin colour as well. If you have a lot your eyes are brown. Albinism is a disorder that either does not make melanin or it is not functional. Their iris does not have much melanin, this causes a lot of light to reach the back of the eye. They have problems with lighting conditions, with acuity some are legally blind (cannot drive). o Rabbit pink eyes, you are seeing a reflection of the blood vessels. C. Lens Description/Function:  A flexible structure that coordinates with the cornea to focus light.  Accommodation: There are ciliary muscles on the ends of the muscles, changes the size of the lens depending on the amount of light that is being let in. o For near focusing situations: To bend the light the lens becomes round meaning the ciliary muscles relax, refract the light. The light ray will then create one point in your eye. o For far focusing situations: The lens flattens out and ciliary muscles constrict, the light does not bend a lot.  The yellow tin protects your eye from ultraviolet light. Disorders/problems of the Lens a. Disorders of Accommodation/and cures i. Myopia(nearsightedness)  Axial myopia: is due to an elongated eye, close light rays from distance in front of the back of the eye. The focal point occurs before the back of the eye, far things to be out of focus. Near thing  Refraction myopia: lens and cornea together are too powerful, bend the light too much.  It can come into focus at the back of your eye, the concave lenses in glasses widen the rays of light out.  Laser Eye Surgery shape the cornea by shaving some of it off, to make the lens and the cornea less powerful. ii. Hyperopia(farsightedness)  The focal point would land behind the back of the eye, the ciliary muscles try to relax the lens as much as possible (bulky and round), but this is not enough. This causes eye strain ( ciliary muscles tried)- as you get older they attain a headache.  Axial Hyperopia: has a flattened out eyeball, it is shortened. However when an object is near, the focal point is behind the eye because the eye ball is shorter.  Refracted Hyperopia: Cornea and the lens are not powerful enough, therefore object don’t come into focus because the light does not bend enough.  Convex lens glasses it bulges outwards, You are trying to compensate for the flattened out lens. It narrows the light rays, so that they can come to a focus at the back of the eye. It takes the wide range of angles, and narrows down the rays of light.  Excimer Laser Surgery: they will carve the cornea to create a bulging combinations. iii. Presbyopia  Middl
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