N'ozuzu, mgbe anyị na-ekwu index nke resin lens, ọ si 1.49 - 1.56 - 1.61 - 1.67 - 1.71 - 1.74. Ya mere, otu ike ahụ, 1.74 bụ nke dị gịrịgịrị, ike dị elu, mmetụta ahụ pụtakwara ìhè.