PSY 457LEC Lecture Notes - Lecture 3: Visual Acuity, Infant Visual Development, Color Vision
Document Summary
Light progresses through the cornea & pupil onto the lens. The lens bends light rays to project a focused image on the retina. Retina consists of 2 types of photoreceptor cells. Cones (in fovea) respond differently to diff wavelength. Optic nerve relays info to the visual cortex to the brain. E. g. , 20/40 see at 20 feet what someone with perfect vision can see at 40 ft (normal: 20/20) 20/200 or worse defines legal blindness in adults. Infants have little if any ability to adjust their lens, Accommodation: ability to focus the lens btwn near & far. Visual acuity: sharpness of vision; the clarity with which fine detains can be discerned. Development of accommodation: what adjustment they can do seems to be better for near than far. Visual development is within the normal adult range by 6-8 months. Towards the second half of the first year, infant visual acuity is at adult levels.
