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CR-39 has the best optical clarity due to the lowest refraction index. It is recommended for low-power prescriptions that do not exceed +1.50 or -1.50 spherical power. Higher power will result in thicker edges and heavier lens. Please note, CR-39 s is not recommended for kids under 18 years old due to low shutter resistance.

CR-39 (-1.50 to +1.50!)

$39.00Price