Question

Typically, the lens of the eye reverses an image, which is flipped over in a subsequent part of the visual process. If John's images are consistently presented upside-down, there is likely to be a problem with the:

a) Cornea
b) Retina
c) Iris
d) Lens

Answer 1

If John is seeing images consistently upside-down, it suggests that there is likely an issue with the lens of the eye, which is responsible for focusing light onto the retina.

Step-by-step explanation:

Typically, the lens of the eye reverses an image, which is then perceptually corrected by the brain. If John's images are consistently presented upside-down, it indicates a problem with the part of the eye that focuses light onto the retina. The correct part of the eye with the likely issue is the lens.

The lens is responsible for focusing light and creating a clear image on the retina. If there is an issue with the lens, this process is disturbed, leading to images being presented incorrectly. The cornea also plays a role in focusing, but it is the lens that adjusts to fine-tune the focus. Conditions like astigmatism can be due to irregularities in the shape of the cornea or lens, but the inversion of images directly implicates the lens's ability to properly focus. This is distinct from the iris, which controls the amount of light entering the eye, and the retina itself, which contains the photoreceptor cells for light detection.