| Sphere | Cylinder | Axis | Estimated BCDVA-UCDVA (Lines of Visual Acuity) |
|---|---|---|---|
| 0 | 0 | 0 | 0 |
- To add additional measurements, click the "Add New Row" button and enter the new refraction.
- Select the "Active" button for each refraction that you want included in the mean calculation.
- Click the "Update Mean" button to calculate and update the mean of all selected refractions.
- The cylinder sign convention will be the same as the one used in the refraction at the top of the page.
- Additionally a field titled "Estimated BCDVA - UCDVA" is reported. This value is the number of lines of visual acuity that one might expect to observe in terms of the difference between best and uncorrected distance visual acuity.
- For example, if an eye has a manifest Rx of 0.00 D -1.00 D x180, the Expected BCDVA - UCDVA ~ 1.7 lines. If the eyes best corrected visual acuity was 20/20, we could expect their UCDVA to be approximately 20/32 +1.
- This estimate is accurate for refractive errors up to 3.00 D of Spherical and Cylindrical error.
The RxSight Refraction calculator is provided only as a guide for calculating the mean refractive prescription of a number of different refraction measurements. The information should not be used for diagnosis or treatment and is not intended to replace clinical judgment or guide individual patient care in any manner. User is hereby notified that the information provided and any figures within this calculator may change at any time without notice. User is advised that RxSight cannot guarantee the results or its accuracy, and User assumes sole responsibility for any decisions made or actions taken based on the information provided. RxSight shall not be liable for any damages, charges, claims, costs, demands, losses, fees, or expenses of any nature or kind arising from User's use or reliance on the calculator.