Early-onset glaucoma (<40 years) is more likely to be inherited according to a classic Mendelian pattern involving single genes, mainly CYP1B1 in primary congenital glaucoma (PCG) and MYOC in juvenile open-angle glaucoma (JOAG), whereas glaucoma in adults tends to be more complex due to its multifactorial inheritance [5, 6]. The gene discussed is MYOC; the disease is juvenile open angle glaucoma.