PSYC 2220 Lecture Notes - Lecture 2: Retinitis Pigmentosa, Macular Degeneration, Ciliary Muscle

• School: York University
• Department: Psychology
• Course: PSYC 2220
• Professor: Ingo Frund

Document Summary

The stimulus distant from our senses: distal stimulus. Electromagnetic spectrum: energy is described by wavelength. Spectrum ranges from short wavelength gamma rays (1/10bnm) to long wavelength radio waves (10km: visible spectrum for humans between 400 and 700nm, most perceived light is reflected light. The eye: membrane (cornea) covers the pupil which houses the lens. The retina covers the back that sensitizes light. Light is transmitted into receptor cells (rods and cones), to then color is perceived by pigment receptor cells. Rods v cones: shape: rods are large and cylindrical whereas cones are small and tapered: distribution on the retina: fovea consists solely of cones peripheral retina has both rods and cones. Visual impairments related to rods and cones: macular degeneration. Fovea and small surrounding area are destroyed: c(cid:396)eates (cid:862)(cid:271)li(cid:374)d spot(cid:863) o(cid:374) the (cid:396)eti(cid:374)a, most common in older individuals, retinitis pigmentosa, genetic disease, rods are destroyed first.