Which of the following is NOT a risk factor for developing early PSC cataracts?

High hyperopia is not considered a risk factor for developing early posterior subcapsular (PSC) cataracts. PSC cataracts are typically characterized by the opacification of the lens in the posterior subcapsular area, and their development is influenced by several factors, including certain medical conditions, lifestyle factors, and systemic medication use.

Retinitis pigmentosa is associated with retinal degeneration and can contribute to cataract formation due to factors such as oxidative stress and changes in lens metabolism. Chronic steroid use is a well-known risk factor for cataracts, particularly due to the impact of steroids on lens protein synthesis and metabolism, leading to increased opacity. High myopia has been linked to changes in the lens and vitreal structures, and it may also contribute to an increased risk of cataracts over time, including PSC types.

In contrast, high hyperopia does not have a direct association with the formation of PSC cataracts. In fact, hyperopia is often related to longer-term changes in other types of cataract development rather than early PSC cataracts specifically. Thus, the absence of a relationship between high hyperopia and the development of PSC cataracts justifies why it is the correct answer in this question.