The aim of this study is to evaluate the efficacy of topical cysteamine eye drops in the treatment of corneal cystine crystals deposits in patients with nephropathic cystinosis.
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Number of participants with improvement of photophobia, corneal cystine crystals and visual acuity following treatment with topical cysteamine 0.55% eye drops in patients with nephropathic cystinosis.
Timeframe: Photophobia, slit lamp assessment of corneal cystine crystals and visual acuity are recorded pretreatment, on each monthly visit up to 48 months.