Noun:

1. an ophthalmoscope with a layer of water to neutralize the refraction of the cornea

orthopanadj.全色的orthoadj.正色(性)的pref.正确；直；正；原orthomethylacetanilid[医] 邻甲苯乙酰苯胺Orthogonia basimaculan.天目胖夜蛾orthocresol phthalein[医] 邻甲酚肽orthographic exercise拼写练习orthosis prescription矫形器处方orthodontic separator正畸分牙圈orthodontic anchorage正畸支抗orthomagmatic deposit正岩浆矿床orthophoto projection正射投影orthographic sythesis正交合成