| 瞳孔 | tóng kǒng | pupil (of eye) | |
| 瞳仁 | tóng rén | pupil of the eye | |
| 瞳眸 | tóng móu | pupil of the eye; one's eyes | |
| 美瞳 | měi tóng | cosmetic contact lens; big eye contact lens; circle contact lens | |
| 双瞳剪水 | shuāng tóng jiǎn shuǐ | clear, bright eyes (idiom) |
| 1 | Under the eyelashes is a pair of misty black pupils. | |
| 2 | In Beijing, men also jump on the bandwagon. University student Lu Zhengwei said he tried wearing grey cosmetic contacts last year. | |
| 3 | But it should be a thorough exam in which the doctor dilates the pupils and examines the optic nerve. | |
| 4 | The exit pupil of a telescope is the circular beam of light that leaves the eyepiece being used and is measured in mm. | |
| 5 | Or, you can calculate the exit pupil by dividing the focal length of the eyepiece (in mm) by the focal ratio of the telescope. |