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1.74 Blue Coat HMC ruwan tabarau na gani
Gilashin ido 1.74 yana nufin ruwan tabarau mai alamar refractive na 1.74, wanda shine wanda yake da mafi girman ginshiƙi a kasuwa, kuma wanda yake da kauri mafi ƙanƙanta. Sauran sigogin daidai suke, mafi girman ma'aunin refractive, mafi ƙarancin ruwan tabarau, kuma mafi tsada zai kasance. Idan digiri na myopia ya fi digiri 800, ana la'akari da shi azaman ultra-high myopia, kuma alamar refractive na 1.74 ya dace.
