Which statement describes the day blind spot?

• A. There are no cones where the optic nerve connects to the retina
• B. There are no rods where the optic nerve connects to the retina
• C. The blind spot is present only at night
• D. The optic nerve exits the eye elsewhere

Answer: (A)

The day blind spot happens where the optic nerve fibers leave the retina at the optic disc, and that area has no photoreceptors. In daylight vision, we rely on cones for sharp, color vision, so being without cones in that spot means daylight samples can’t be formed there. The brain often fills in the missing detail, so you don’t notice it during normal viewing. There are no rods there as well, but rods are mainly used in low light, so describing the absence of cones is the most direct way to explain why this blind spot shows up in daylight. The other statements don’t fit because the blind spot isn’t limited to night, and the optic nerve exits the eye at the optic disc, not somewhere else.