Which type of visual deficiency may result in an inability to see at night?

Retinitis Pigmentosa is a genetic disorder that leads to the progressive degeneration of the retina, specifically affecting the photoreceptor cells responsible for vision. Individuals with this condition often experience difficulty seeing in low-light conditions or at night, a symptom known as night blindness. The deterioration of rod cells, which are more sensitive to light and essential for vision in dim environments, is primarily responsible for this inability.

Cataracts can cause blurred vision and glare, particularly in bright light, but do not specifically lead to night blindness. Hyperopia, or farsightedness, is a refractive error that affects clarity for close objects and does not typically influence night vision. Likewise, presbyopia is an age-related condition characterized by difficulty focusing on near objects and also does not directly affect night vision abilities. Hence, Retinitis Pigmentosa is the condition most closely associated with the inability to see at night due to its direct impact on the retinal photoreceptors responsible for low-light vision.