| 摘要 |
An eyepiece lens comprising a single gradient-index lens having a positive refracting power, or comprising a radial gradient-index lens having a positive refracting power, and a field lens, wherein the following Eqs. are satisfied:1< PHI m/ PHI <1.5(1)| PHI S1/<- PHI S2(2)-0.01<1/V1<0.025(3)where PHI is the refracting power of the radial gradient-index lens, PHI m is the refracting power of a medium of the radial gradient-index lens, PHI S1 is the refractive power of a surface located on the eye side of the radial gradient-index lens, PHI S2 is the refracting power of a surface located on the object side of the radial gradient-index lens, and V1 is a coefficient of color dispersion of the medium of the radial gradient-index lens.
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