Sunlight can be split into various colours, or waves, which are visible to the naked eyes, and other waves that we do not see, namely infrared and UV rays. UV rays come in three different types, each named with an initial that describes their harmful effects on our bodies:

Lazy eye, or in medical terminology: amblyopia, happens when vision in one eye isn't as sharp as it should be at a certain stage in a person's development. Lazy eye is typically noticed in infancy and early childhood, where the condition manifests as one eye having reduced visual acuity compared to the other. In some cases, both eyes can fail to develop normal visual acuity.