Your prescription, which also specifies the direction of the prism's thickest edge or base, determines the position and orientation of the prism indicated by BU (base up), BD (base down), BI (base in), or BO (base out). We hope this detailed guide makes it a snap to read and und...
OD vs. OS: One for each eye Eye doctors use the abbreviations “OD” and “OS” to denote your right and left eyes. Your eye doctor may give you a paper prescription that looks something like this. OD is your right eye.OD is short foroculus dexter, the Latin phrase for “right eye...
Single Vision Prescription: OD (Right): SPH ?, CYL?, AXIS ? OS (Left): SPH?, CYL?, AXIS ? PD (far or near): ? (your Pupil Distance) Progressive Prescription: OD (Right): SPH ?, CYL?, AXIS ? Add:? OS (Left): SPH?, CYL?, AXIS ? Add:? PD (far or near): ? (your ...
Dual PD has two numbers showing the right eye (OD) and the left eye (OS) measurements. How to find yours To obtain your PD measurement, simply ask your eye doctor to include it in your prescription. Alternatively, you can use one of the following methods to measure it yourself. Super ...
Yoked prisms create no overall glasses prescription power difference right vs. left eye, BUT yoked prism does change the perception of space by shifting the image location for the visual system. In our 5Δ BU OD / 5Δ BU OS example, the image is shifted DOWN (remember, the image shifts...