SURGICAL
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USING THE LRI CALCULATOR 

The LRI calculator is designed to help you provide minor astigmatism correction to cataract patients. Developed to assist limbal relaxing incision planning for phacoemulsification cataract surgery, the LRI calculator provides simple calculations specifically for manual LRIs.

DIRECTIONS

Remember, the LRI calculator is for manual incisions only.

  1. First, select your viewing preferences for the preview image.
    • Degree-based versus clock-based scale
    • Superior versus temporal perspectives
  1. Input your information and your patient’s information.
  1. Select your preferred nomogram: Donnenfeld (DONO) or Nichamin Age and Pachymetry Adjusted (NAPA).
  1. Fill in the patient’s measurements.
    • Fill in the measurement for surgically induced cylinder or astigmatism (SIA) and incision location (IL) when performing phaco incisions
  1. Review the patient’s information, and click "continue" to see a preview of incision locations.

For additional information about LRIs or intraoperative astigmatism correction, explore the LRI calculator page.

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