Wollaston doublet

Wol·las·ton doub·let

a combination of two planoconvex lenses in the eyepiece of a microscope designed to correct the chromatic aberration.
[William H. Wallaston]

Wol·las·ton doub·let

(wōl'ă-stŏn dŭb'lĕt)
A combination of two planoconvex lenses in the eyepiece of a microscope designed to correct the chromatic aberration.
[William H. Wollaston]

Wollaston,

William H., English physician and physicist, 1766-1828.
Wollaston doublet - a combination of two planoconvex lenses in the eyepiece of a microscope designed to correct the chromatic aberration.
Wollaston theory - a theory that the semidecussation of the optic nerves at the chiasm is proved by the homonymous hemianopia seen in brain lesions.