After completing a minimum of 3 consistent Vision Tests you will receive your EyeGlass Numbers (EGN). These are a set of numbers that contain parameters defining refractive error needed for ordering eye glasses. If you take 3 tests and do not see any EyeGlass numbers this indicates one or more tests are inconsistent. As of the application PVT 2.1 and VisionCheck 2.0, you can check your inconsistent tests by selecting the "individual tests" button on your app's dashboard. This will provide a list of your past tests and any tests that are highlighted in red are considered inconsistent. Please continue to take more tests until you have successfully reached 3 consistent results.
An example of an EyeGlass Number (EGN) record looks like:
|PD:||NV Add +2.00|
The EGNs may seem familiar to you because they are written in the same format as your eye doctor's prescriptions. Note that Cylinders are expressed in negative Cylinder notation.
- Spherical & Cylindrical values are measured in Diopters and represent components of your Refraction Correction
- Axis represents the angle of the Cylindrical component makes with respect to an imaginary horizontal line through your eye.
- PD corresponds to the Pupillary Distance in millimeters (mm). This is the distance between your two eyes.
- NV ADD is called the near vision add and is needed for persons with Presbyopia.