Humans have, compared to many animals such as cats and dogs, very poor night vision; you can thank our lack of tapetum lucidum, the layer of tissue found directly behind the retina of many animals that helps reflect visible light back through the retina (both boosting the animals night vision and giving them spooky reflective eyes). (howtogeek.com)
This reflective coating is generally and mainly called tapetum. (yorkiemag.com)
Due to the «masked affected» phenomenon, in which the developing tapetum pigmentation obscures areas of choroidal hypoplasia, it is vital that all puppies be checked at a young age, certainly no later than 8 weeks, preferably sooner. (ashgi.org)