L is the English abbreviation, representing Left means left and Right means right. In ophthalmology, the left eye and right eye are not routinely represented in this way, usually OD represents the right eye and OS represents the left eye, which is the English abbreviation. If the whole medical record is in Chinese characters, use Chinese characters, try not to use English abbreviations, sometimes it is customary to use English to write the eye, bare eye vision or intraocular pressure, like intraocular pressure are used IOP, visual acuity use V instead, the axial degree of optometry sometimes use DS or DC to express.