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)
More interesting to me is that the question describes a unilateral tapetum lucidum, which is quite unusual. (dogingtonpost.com)
In addition, the reflective tissue (tapetum lucidum) in reindeer eyes changes from a rich golden color during the summer months to a deep blue color during the winter months. (sciencedaily.com)