By combining DO lens elements with normalrefraction elements, color aberration is corrected to levels even higher than is possible with fluorite elements.
DO镜片与普通的折射玻璃结合在一起，色散的校正水准甚至高于萤石镜片。
2
Therefore, the refraction image has very good reliability in distinguishing normal or disease tissues, as well as for industrial inspection.
因而，折射图像用于辨别正常组织与病变组织、工业检测等方面具有很好的可信度。
3
The left eye was entirely normal, with normal vision and refraction for his age.