Ophthalmic OpticsQuestion 4 of 100
Which lens material has the highest Abbe value, meaning the least chromatic aberration?
a.Polycarbonate
b.1.67 high-index
c.CR-39 (1.498)
d.1.74 high-index
Explanation
CR-39 plastic has an Abbe value near 58, the highest among these options, so it produces the least chromatic aberration. Higher-index materials such as 1.67 and 1.74 have lower Abbe values and more color dispersion.
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