Placing prisms in front of the eyes causes the viewed object to be projected onto which retina area?

Placing prisms in front of the eyes causes the viewed object to be projected onto which retina area?

• A. The image is projected on a different area of the retina away from the fovea (direction depends on prism base direction)
• B. The image remains exactly on the fovea
• C. The image is projected onto the optic disc
• D. The image is inverted but remains on the fovea

Answer: (A)

When a prism is placed in front of the eye, it bends the incoming light, shifting where the image lands on the retina. This causes the retinal image to appear at a different location rather than exactly at the fovea. The direction of that shift depends on the prism’s base orientation—the light is bent toward the base, so the retinal image moves accordingly. So the correct idea is that the image is projected onto a retinal area away from the fovea, with the specific direction dictated by the prism base. The other options don’t fit because the prism doesn’t keep the image固定 on the fovea, it doesn’t project specifically onto the optic disc, and while the eye’s optics do invert images, the prism’s effect is to shift the location on the retina rather than simply preserving foveal alignment.

When a prism is placed in front of the eye, it bends the incoming light, shifting where the image lands on the retina. This causes the retinal image to appear at a different location rather than exactly at the fovea. The direction of that shift depends on the prism’s base orientation—the light is bent toward the base, so the retinal image moves accordingly.

So the correct idea is that the image is projected onto a retinal area away from the fovea, with the specific direction dictated by the prism base. The other options don’t fit because the prism doesn’t keep the image固定 on the fovea, it doesn’t project specifically onto the optic disc, and while the eye’s optics do invert images, the prism’s effect is to shift the location on the retina rather than simply preserving foveal alignment.