The purpose of this study is to understand better how many people who have been diagnosed with early-onset idiopathic bilateral cataracts may have a rare but treatable disease called Cerebrotendinous Xanthomatosis (CTX)

We propose a prospective observational analysis of near visual acuity and stereopsis in pseudophakic children. Visual acuity analysis will be standardized based on age per PEDIG protocols. Results will be stratified by age and by monocular versus binocular surgery. Children will be assessed in their appropriate corrective lenses to control for myopia as a confounding factor. Refractive error will be measured to optimize visual acuity measurement and assess for the potential role of astigmatism in preservation of near visual function.