EASYSIGHT will help you to understand optical abbreviations. Here is a list of some optical abbreviations
1). ADD or NV ADD : Near Vision Reading addition . It is needed in Bifocal or progressives glasses.
2). AR : Anti-Reflection Coating click here to know more.
3). Axis : The angle at which the Cyl is placed in lens to correct an astigmatism.
4). BAL : Balance lenses , meaning the same prescription for each eye.
5). BD, BI, BO, BU : ‘B’ Stands for Base and BD for ‘Base down’ BI for Base In , Bo for Base out and BU for Base Up, These are prism correction on your Rx indicated by Δ.
6). CYL: The Cylinder CYL corrects an astigmatism combined with Axis.
7). DS : Diopter Simplex. It can be written in CYL field if CYL is not needed.
8). DV : Distance Vision.
9). FT : Flat Top Biofocal.
10). NV : Near Vision.
11). NV ADD or ADD : Near Vision Reading or Addition.
12). OD : Oculus Dexter, Meaning Right Eye.
13). OS : Osulus Sinister, Meaning Left Eye.
14). OU : Oculus Uterque, Meaning each Eye.
15). PAL : Progressives Addition/Adjustment lens.
16). PD: Pupillary Distance Meaning Distance between your both Pupils Click here to know more.
17). PL : Plano meaning Plane. It can be written in any OD or OS to show no correction is needed.
18). RX : A prescription
19). SPH : Spherical, uses for nearsighted or farsighted correction.
20). UV : Ultra-Violet. The Light which is invisible and harmful light for human eye. EASYSIGHT provides sunglasses with UV protection.
21). VA : Visual Acuity. Indicates how well the eye can see.
22) . Δ : Prism used for positional or convergence correction in double vision/ diplopia caused by strabismus, (a condition in which any of six muscles does not Co-ordinate in eye movement)
