Since more information is required before making a decision, this could be either a converging or diverging lens.
Single-vision lenses are designed to treat a single-vision issue and have a single, constant focal power. With no discernible line separating the focal powers as they "advance" from top to bottom, progressive lenses can treat multiple vision conditions. Concave lenses are used to correct myopia or nearsightedness.
A polycarbonate material with a specific gravity of 1.20 and an index of refraction of 1.586 is particularly impact-resistant. This enables lenses to be far more impact resistant, thinner, and lighter than CR-39. The ideal material for safety eyewear and for use with youngsters is polycarbonate.
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