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- He suffers from an optical defect. 他有视觉障碍。
- Move the glasses slowly across the line.If it seems to wiggle, sway or curve, the lenses contain an optical defect and should be replaced with another pair. 拿着眼镜慢慢的横向移动，如果这些直线看上去摇晃或歪曲，那么镜片有光学瑕疵，需要换一个。
- He has an optical defect. 他有种视力缺陷。
- An optical defect. 视觉缺陷
- A mirage is an optical illusion. 海市蜃楼是一种视错觉。
- An imperfect image caused by a physical defect in an optical element, as in a lens. 色差由于光学器件(如透镜)的物理缺陷而造成的不完美成象
- I thought I saw a ghost but it was just an optical illusion. 我以为我看见鬼了，其实只是一种幻觉。
- A light-sensitive unit used with an optical arrangement for scanning images. 与光学装置一起用来扫描图象的一种光敏装置。
- An optical effect proper to fluids. 液体所固有的光学效果
- A kaleidoscope is an optical toy. 万花筒是一种光学玩具。
- To adjust the line of sight of(an optical device). 校准调整光学仪器瞄准器
- A microscope is an optical instrument. 显微镜是光学仪器。
- The eyepiece of an optical instrument. 光学仪器的目镜
- An optical disk, especially a compact disk. 光盘，尤指微缩盘
- An imperfect image caused by a physical defect in an optical element,as in a lens. 色差由于光学器件（如透镜）的物理缺陷而造成的不完美成象
- My camera has an optical viewfinder. 我这个照相机装有光学取景器。
- The process of enlarging the size of something, as an optical image. 放大放大某一物体的尺寸，如一个光学图像的尺寸
- The lake in the desert was just an optical illusion. 沙漠中的湖泊只是一种视力错觉。
- an optical defect 视觉缺陷
- A lens is an optical system including two refracting surfaces. 一个透镜是包含两个折射面的光学系统。
