Blind Spot
Purpose
Students locate their visual blind spot--the region where the optic nerve exits the retina with no photoreceptors. Demonstrates that the brain actively fills in missing visual information rather than passively recording images.
Figure 1:
Classroom setup: ABCD reference card on the left with individual letter targets spaced across the boards at intervals of 2-7 meters, corresponding to student seating distances.
Figure 2:
Individual blind spot test cards for student handout. Instructions: close left eye, look at X, and the O disappears at the correct viewing distance. Smiley face variant included.
Equipment
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