1. Visual Perception Kit
Carolina
$117.00

2. Time Required Approximately 8 minutes per station
With 10 stations that will require 80 minutes
Additional time is required to answer assessment and review questions

3. Preparation Prior to lab review eye structure and function
Lab is designed so that 10 stations can be set up and instructions for each station are included
Pre-lab set-up
Wrap white paper lengthwise around pencils
Set up “Depth Perception Tester” on level surface

4. Pre-lab Activities
Demonstrate visual acuity test and benefit of corrective lenses
Have students predict and then identify their dominant eye
Look at an object ~3m away
With both eyes open, hold your thumb arms’ length and “cover” the object with your thumb
Close right eye
Results – if your thumb appears to move to the right, the right eye is dominant. If your thumb did not seem to move, your left eyes dominant.

5. Activities Included Visual Acuity Astigmatism and Blind Spot
Visual Mapping
Color Vision
Depth Perception
Accommodation
Near Point
Peripheral Vision
Afterimages
Illusions

6. Astigmatism and Blind Spot
Visual Acuity
Uses Snellen chart (eye chart) to determine emmetropia (normal vision), hyperopia (farsightedness), myopia ( nearsightedness)
Astigmatism and Blind Spot
Astigamatism- irregular shape of cornea or lens
Results in blurred or distorted images
Blind spot- area on retina with no photoreceptors
Visual Mapping
Used to determine the size of the fovea centralis
Fovea centralis- area of eye with greatest visual acuity, contains more cone cells than any other region of eye

7. Color Vision Depth Perception Accommodation
Cones- cells in retina which see color
Rods- cells in retina which see dim light and shades of gray
Different cones work together to see different colors
Depth Perception
Ability to judge the relative distance between objects in three dimensions
Done using monocular vision(seeing with one eye) and binocular vision(seeing with two eyes)
Accommodation
Combination of reflex actions by which the lens of the eye changes to keep the focal length constant
If works normally= emmetropia
If eye ball is deeper than normal = myopia
If eye ball is not deep enough= hyperopia

8. Near Point Peripheral Vision Afterimages Illusions
Minimum distance at which the eye can focus on an object
Peripheral Vision
Ability to see things which fall outside the direct line of vision
Used in the detection of motion
Afterimages
Optical illusion that occurs when looking away after staring intently at certain images or colors
Illusions
Deceptive, self-contradictory, or misleading images
Visual tricks which take place in the brain rather than the eye

9. Today… Get in groups of 3 We will test our Depth Perception
Peripheral Vision
Illusions