What does the abbreviation “OS” stand for in optometry?

The abbreviation "OS" in optometry stands for "Oculus Sinister," which translates to "left eye" in Latin. This terminology is commonly used in the field of optometry and ophthalmology to differentiate between the right and left eyes when documenting patient information, such as prescriptions or examination findings. In this context, "Oculus Dexter" refers to the right eye, while "Oculus Sinister" indicates the left eye. By using these Latin terms, practitioners can standardize communication regarding visual health and treatment options. Understanding these abbreviations is essential for anyone working in an optometric setting, as it enhances the clarity of documentation and patient care.