NR on a glasses prescription stands for “Non-Reactive.” It shows that both pupils react normally to light. This term is important for assessing vision stability. The prescription also includes OD (Oculus Dexter for the right eye) and OS (Oculus Sinister for the left eye) to specify the lens power needed for clear sight. Common abbreviations … Read more
OD means “oculus dexter,” which is Latin for “right eye.” OS refers to “oculus sinister,” meaning “left eye.” These abbreviations are important for eye care professionals when writing your glasses prescription. They ensure that each eye receives the correct corrective lenses. OD stands for “oculus dexter,” a term derived from Latin. It refers to the … Read more
The term “mm” on a glasses prescription means millimeters. It indicates important frame measurements: 1) Lens width, 2) Bridge width, and 3) Temple length. Each measurement is crucial for achieving a proper fit and comfort when wearing the prescription frames. All values are shown in mm. For example, a common format displays measurements like 52-18-140, … Read more
A minus sign (−) on a glasses prescription means nearsightedness. This condition causes clear vision at close range and blurred vision at a distance. The minus sign is found in the sphere (SPH) column, indicating the lens power needed for visual correction and better vision clarity. A plus sign (₊) indicates farsightedness. For example, a … Read more
The sphere (SPH) measures lens power in prescriptions. A negative sign (-) indicates nearsightedness, and a positive sign (+) indicates farsightedness. The numbers show diopters, the unit for lens power. OD means the right eye, and OS means the left eye. ADD signifies extra power for reading glasses. The sphere number indicates the degree of … Read more
Non-prescription glasses, also known as fashion eyewear, do not correct vision. They act as stylish accessories and can include features like blue-light blocking technology. This technology helps reduce digital eye strain. These glasses are popular choices in current fashion trends. Another significant aspect is the affordability of non-prescription glasses. They are generally less expensive than … Read more
A plus sign (+) in an eyeglass prescription means farsightedness, indicating better distance vision. A minus sign (-) means nearsightedness, indicating better close vision. The numbers represent diopters, which measure lens power. OD refers to the right eye, while OS refers to the left eye. Next, the cylinder (CYL) measures astigmatism. This condition occurs when … Read more
Lens index measures the thickness of lenses in prescription glasses. A higher index means thinner lenses, improving comfort and visual clarity for stronger prescriptions. Lower prescriptions usually require a lower lens index. Lens categorization helps determine the appropriate refractive power and optical characteristics based on individual needs. When choosing the lens index, consider your prescription … Read more
Polycarbonate lenses are strong and lightweight. They resist impact and provide good vision correction. The anti-reflective (AR) coating reduces glare by minimizing reflective light on both sides of the lens. This coating enhances clarity and comfort. Be sure your prescription includes these features for the best results. The key advantages of Polyarc lenses include sharper … Read more
O.S. means oculus sinister, which refers to the left eye in a glasses prescription. O.D. means oculus dexter, indicating the right eye. These acronyms help eye care professionals detail lens measurements for each eye, ensuring the right glasses prescription for accurate vision correction. To read an OS size, start with the sphere value. A negative … Read more