Hemeralopia is a poor term to use as English speaking and Continental ophthalmologists use it to mean the exact opposite physiologically:
- English school: means day blindness as in total colorblindness (ie usually due to selective dysfunction of cone cells. All standard English dictionaries agree with this usage.
- Continental school: means seeing in the day so is used as technical term for night blindness (usually due to selective rod cells dysfunction). Contrast with nyctalopia.
- This is a disambiguation page.