Which factors can contribute to the formation of cataracts?

The formation of cataracts can indeed be influenced by injury, congenital issues, and exposure to heat. Each of these factors plays a role in the natural processes that lead to the clouding of the eye's lens. Injury to the eye can cause changes in the lens that promote cataract development, while congenital issues mean that some individuals are predisposed to cataracts from birth due to genetic factors. Additionally, exposure to excessive heat can lead to changes in the eye's lens structure, contributing to the cataract formation.

The other factors listed in the options involve different health considerations that, while they might affect overall eye health or general well-being, do not have a direct correlation with cataract formation as strongly as the factors chosen. For instance, while diabetes, hypertension, and obesity can lead to other complications in eye health, the direct connection to cataracts is less defining than the clear associations seen with injury, congenital factors, and thermal exposure.