1.61 index is ideal for power less than -4.00,.1.56 index is ideal for power less than -2.00,.So, here’s a guide on how to choose lens with ideal thickness Sometimes, you may not need to choose the thinnest lens if the benefit is not substantial. It is no brainer to always go for the thinnest lens. Must know : How to choose the ideal thicknessīy now you must have had a better understanding about lens thickness. Besides, heavier lens can cause the glasses to slip down easily. Thicker lens is generally heavier. You wouldn’t want a pair of heavy glasses sit on your nose the entire day and leave red mark. You wouldn’t want to match it with thick lens, don’t you? That will definitely defeat the purpose of getting a thin frame. It looks clean, simple and easily pulled off by just anyone. Therefore, choosing thinner lens can easily hide your prescription. Most people associate thick lens with high power. You wouldn’t want your friends to make fun of your prescription nor letting others know your high prescription. There are many advantages for choosing thinner lens. Therefore, for the same prescription and lens index, the larger the frame, the thicker the lens will turn out. Since the lens thickness increases exponentially, as the frame size gets larger, it will utilize the side of the lens, which is also the thicker part. There is no good or bad effect associated with the pupillary distance. Pupillary distance is an absolute measurement which intrinsically depends on wearer’s face size and eye. The calculation can be a bit tedious but do remember the relationship between pupillary distance and lens thickness. The wider the pupillary distance, the lens will be thinner. The idea is to align the optical center to the pupillary center so that we can minimize distortion and optimize the vision. Pupillary distance is the distance between two pupil centers. If you want to find out how much the glasses cost with different type of lens, click the link in the button. For power more than that, choose the thinnest lens, 1.74 index.If your power is around -6.00, choose 1.67 index, it will be around 4 to 5mm.For power around -4.00, choose 1.61 index, it will be around 3 to 4mm.
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