night blindness (nyctalopia, nocturnal amblyopia, nyctanopia)

Introduction

Decreased ability to see in reduced illumination.

Etiology

• impaired retinal rod function
  • vitamin A deficiency

Notes

• no general agreement which term, hemeralopia or nyctalopia, means night blindness & which means day blindness

More general terms

• sign/symptom
• retinal disease

More specific terms

• congenital night blindness

Additional terms

• day blindness (hemeralopia, hemeranopia)

Database

• OMIM: https://mirror.omim.org/entry/310500