This study is designed to evaluate the effect of ataluren on Maximum Reading Speed as measured using the Minnesota Low Vision Reading Test (MNREAD) Acuity Charts in participants with nonsense mutation aniridia. This study involves a 4-week screening period, a 144-week treatment period (Stage 1: Weeks 1 to 48 \[double-masked treatment\] and Stage 2: Weeks 49 to 144 \[open label treatment\]), an optional 96-week open label extension sub-study, and a 4-week post-treatment follow-up period (either study completion or early termination). Participants that choose not to participate in the sub-study will be required to complete the post-treatment follow-up visit at the end of the Stage 2 open-label extension.
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Percent Change From Baseline in Maximum Reading Speed of Oculus Unitas (OU) (Both Eyes) at Week 48, as Measured Using the Minnesota Low Vision Reading Test (MNREAD) Acuity Charts
Timeframe: Baseline, Week 48