Hemeralopic refers to a condition in which individuals experience difficulty in seeing in low light conditions, such as at dusk or nighttime. There are several synonyms used to describe this condition, including night blindness, nyctalopia, and day blindness. Night blindness implies difficulty in seeing at night, while nyctalopia is a medical term that specifically refers to a decreased ability to see in low light conditions. Day blindness is the opposite of night blindness and refers to a decreased ability to see during the day. Other synonyms for hemeralopic include twilight vision impairment, dark adaptation deficiency, and impaired vision in low light. Overall, these synonyms highlight the challenges in seeing in low light conditions.