Question

At night, a problem that people with poor night vision face is:

a. difficulty discerning low-contrast objects

b. difficulty identifying the color of an object

c. difficulty keeping their eyes moving

d. difficulty seeing under artificial light

Answer 1

At night, people with poor night vision primarily experience difficulty discerning low-contrast objects due to reliance on rod activity, which is less capable of detecting fine detail and color. Vision defects such as myopia, hyperopia, and presbyopia affect how light is focused on the retina, leading to blurred vision and the need for corrective eyewear.

Step-by-step explanation:

At night, people with poor night vision commonly face the problem of difficulty discerning low-contrast objects. This issue arises due to the way our photoreceptors work in low light conditions. Our eyes have two types of photoreceptors: rods and cones. Cones are responsible for color vision and sharpness of vision (acute vision) and are most effective in bright light. Rods, on the other hand, are more sensitive to light and are crucial for seeing in dim conditions, but they do not discern color well and are less capable of detecting fine detail. Therefore, at night or in a poorly lit environment, our vision is primarily dominated by rod activity.

Individuals who struggle to transition from cone dominance to rod dominance might experience night blindness, which is the inability to see well in dim light. Moreover, individuals with certain vision correction issues like myopia (nearsightedness), hyperopia (farsightedness), or presbyopia may face additional challenges. Those who have undergone LASIK to correct distant vision will still need reading glasses for close work if they have presbyopia, because presbyopia affects the eye's ability to accommodate, or focus on close objects.

Lens too strong or Eye too long

Myopia occurs when the eye's lens is too strong, or the eye is too long, causing images to focus in front of the retina. Hyperopia happens when the eye does not sufficiently converge the rays from a near object onto the retina. As we get older, many people develop presbyopia and require reading glasses due to changes in the lens's flexibility. After age 55, need for reading glasses is often due to the lens's decreasing ability to accommodate, rather than problems with the cornea, elongation of the eyeball, or thinning of the retina.

Answer 2

The correct answer is: Option A.

" Difficulty identifying the color of an objetc"

Poor night vision can also be called Nyctalopia or night blindness, and it consists of difficulty to seeing under low light. At night, it is almost imposible to a person distinguish colors of objects in the dark, for example, under the low light condition, with the lack of natural light. The person with this condition cannot see the right color of an object, because it will be always dark.