optically

adverb
op·​ti·​cal·​ly | \ˈäp-ti-k(ə-)lē \

Medical Definition of optically 

1 : by means of sight : with or to the eye as viewed optically

2 : with reference to or by means of optics : with reference to optical properties object deformation was…measured optically— G. N. Duda et al

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