Tools · Professional education
RST Calculator
Estimate residual stromal thickness after entering Corneal thickness and Flap/Cap thickness.
How to interpret the result
RST = corneal thickness − flap/cap thickness − ablation depth. The 300 µm marker matches the app’s warning setting; it does not establish surgical safety or suitability. Confirm against the treatment platform’s planning output and the full clinical assessment.
Table source: GCEO iPhone app. Calculations stay in this browser; no measurements are saved or sent to a server.
AAO EyeWiki: Calculation for LASIK ablation