Dim-light vision

Definition

Dim-light vision refers to the ability of the eyes to see in low light conditions. It relies on the function of rod cells in the retina, which are more sensitive to light than cone cells.

5 Must Know Facts For Your Next Test

1. Rod cells play a crucial role in dim-light vision and are responsible for detecting light intensity.
2. Vitamin A deficiency can impair dim-light vision due to its role in producing rhodopsin, a pigment essential for rod cell function.
3. Dim-light vision is essential for activities such as night driving and navigating poorly lit environments.
4. Nutritional factors, like zinc and omega-3 fatty acids, support overall eye health and can indirectly affect dim-light vision.
5. Certain pulmonary diseases can lead to hypoxia (low oxygen levels), which may impair visual functions including dim-light vision.

Review Questions

• Which type of retinal cells are primarily responsible for dim-light vision?
• How does vitamin A deficiency affect dim-light vision?
• Name one nutritional factor other than vitamin A that supports eye health and may influence dim-light vision.

Related terms

Rhodopsin: a pigment found in rod cells that is crucial for converting light into electrical signals.

Cone Cells: retinal cells responsible for color vision and visual acuity under bright light conditions.

Hypoxia: a condition where insufficient oxygen reaches tissues, potentially affecting various bodily functions including vision.