Question

The region where the image is sharpest is known as

• A. Blind spot
• B. Rod region
• C. Retina
• D. Fovea

Answer 1

The correct option is D

Fovea

The correct option is D:

The explanation for the correct option:

1. A depressed region is present at the centre of the retina.
2. It is yellowish and so is known as a yellow spot.
3. This region is also known as fovea or fovea centralis.
4. The clearest and brightest image is formed in this region.

The explanation for the incorrect options:

Option A:

1. The junction between the origin of the optic nerve and the posterior end of the retina lacks any photosensitive cells (rod and cone cells).
2. This area does not form any image.
3. This part of the retina is known as the blind spot or optic disc.

Option B:

1. There are two types of photosensitive cells present in the retina of the human eyes - The rod cells and the cone cells.
2. Rod cells are sensitive to lower intensities of light.
3. They are actually for the night vision.
4. These cells can not perceive colours.
5. Rod cells and cone cells are not uniformly distributed in the retina.
6. Rod cells are restricted to the rod regions of the retina.

Option C:

1. The most internal layer of the human eye.
2. This layer is made up of nervous tissue and connective tissue.
3. This layer is also known as the neural layer.
4. There are two types of photosensitive cells (rod cells and cone cells) present in this layer.

Final answer: The region where the image is sharpest is known as the fovea.