Class Notes (806,428)
Canada (492,246)
Psychology (4,968)
PSYCH 2E03 (70)

introduction to vision (2).docx

4 Pages
Unlock Document

McMaster University
Gautam Ullal

September 28 , 2012 Psych 2E03: Sensory Processes Introduction to Vision (2) Errors of refraction - normal or emmetropic eye: no problem in terms of diffraction - hepermetropia far sight or hyperopia: eye ball is shorter causing image to fall behind the retina, hold objects further away, convex lens = converging lens - myopia or short sight: longer than focal lens, image falls in front of the retina, corrected with concave = diverging lens - astigmatism: when the focal points of different curvatures of the eye do not meet at one point, the image appears broken Cross section of astigmatic eye - vertical and horizontal and oblique curvatures are not the same - brain makes top-down correction process - blur zone: horizontal and vertical light rays have different focal points - astigmatism dial: ask which lines they can’t see clearly Corneal mapping Cylindrical lens and contact lens for astigmatism - contact lens, and alternative for irregular astigmatism - cornea becomes irregular in shape - corneal mapping Aquesous humor and Vitreous humor - anterior segment contains aqueous humor. Posterior segment contains vitreous humor (or vitreous body) - behind lens and cilliar body posterior segment: vitreous humour - everything in front of the lens: anterior segment containing aqueous humor Circulation of aqueous humor - aqueous is being secreted Few facts about aqueous humor - transparent fluid inside anterior segment of the eye (anterior segment=posterior chamber+anterior chamber) - blood capillaries in cilliary body>posterior chamber pupol>anterior chamber>canal of Schlemm>blood then gets recycled - important functions: intra-ocular tension of 10-155mm HG, nutrition to lens and cornea & scavenge wastes - abnormal increase in IOT:  glaucoma: IOT>25mm Hg –
More Less

Related notes for PSYCH 2E03

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.