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单词 optical centre
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optical centre
optical centre n. the point on the optical axis of a lens where all rays passing through it remain unrefracted.
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1801 Philos. Trans. (Royal Soc.) 91 41 The optical centre will be therefore..about one-tenth of an inch from the anterior surface: hence we have 22 hundredths, for the distance of the centre from the cornea.
1847 A. Smee Vision in Health & Dis. iii. 37 The adjustment of the exact centre of the glass to the optical centres is so important in practice, that I have contrived an instrument to measure the width accurately between these centres.
1989 Encycl. Brit. XXVII. 140/2 In the eyes of animals active during the day.., the lens is smaller; as a result, the optical centre is closer to the front of the eye.
extracted from opticaladj.n.
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