Blind Spots

Question 1

Night blind spot:

Answer 1

• Located in fovea (central viewing axis).
• No rods, only cones.
• 5-10 degrees of central visual field.
• Compensated with scanning and off-center viewing.

Question 2

Day blind spot:

Answer 2

• Located 15 degrees from fovea at optic disk (where optic nerve enters the eye).
• No photoreceptor cells.
• Encompasses 5.5-7.5 degrees of visual field.
• Compensated with binocular vision.