Doctors from Oregon Health and Science Institute, Portland uses gene editing tool CRISPR(Clustered Regularly Interspaced Short Palindromic Repeats) technology to cure blindness who have suffered from Leber congenital amaurosis. Key Points: Leber congenital amaurosis is the Blindness in early childhood. About CRISPR: CRISPR is a tool for locating and cutting DNA (Deoxyribonucleic acid) at a specific spot.