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IOL Power Calculations

  IOL Power Calculations
Physician Downloads
IOL Power Calculations IOL Power Calculations
Optical Biometry Optical Biometry
SIA Calculator
Physician Downloads Surgically-induced Astigmatism
Haigis Formula Optimization
Haigis Instructions
Refractive Vergence Formula
Correcting for Vertex Distance
Lenstar User Manual Free Download LENSTAR® User Manual (pdf)
IOL Master Manual Free Download IOLMaster® Checklist (pdf)
IOL Master Manual Download IOLMaster® User Manual (pdf)
IOL Master Manual Download IOLMaster® Manual V.5.4 (pdf)
IOL Master Manual Download IOLMaster® Manual V.5 (pdf)
IOL Master Manual Download IOLMaster® Manual V.4 (pdf)
IOL Master Manual Download IOLMaster® Manual V.3 (pdf)
Special Thanks

Physician Downloads.

  Dr. Hill volunteers hundreds of hours and his personal resources to make the information on this website available to you. If you would care to buy him a cup of coffee, donate towards operating expenses, or just to say thank you, your contribution is welcome.

Surgically Induced Astigmatism Calculator

The SIA Calculator is now offered online with automatic updates. Click on the above link.

Haigis Formula Optimization:

Requests from technicians or staff are NOT accepted.

Haigis Formula Optimization Haigis Optimization requires a significant amount of Dr. Hill's personal time to complete. Requests for his service must come DIRECTLY FROM THE SURGEON whose data it represents. Requests from personnel will be returned unanswered.

1. Haigis Formula Optimization ~ Read Instructions

Your data must be entered correctly - follow the instructions exactly.

iol power formula calculations Haigis-instructions.doc (Word)
This document is a set of detailed instructions on how to complete and submit the Excel spreadsheet that will be used to derive your set of surgeon and IOL specific a0, a1 and a2 Haigis constants for optical biometry.

2. Haigis Formula Optimization ~ Physicians ONLY

Haigis Formula Haigis Formula Optimization — Haigis-300.xls (Excel)
This Excel spreadsheet is used to submit data for optimizing the a0, a1 and a2 constants for the Haigis formula. The corneal power must be entered in diopters and not mm.

If less than 200 valid cases are submitted, only the a0 Haigis constant will be optimized with the Haigis a1 and the a2 constants set at default values. Ideally, you would submit a minimum of 225 cases, so at least 200 cases will remain after the exclusion of possible outliers.

Subject line to read: "Haigis Optimization".
Include the following:

  1. Your name (the requesting surgeon).
  2. Completed Haigis-300.xls spreadsheet
  3. Manufacturer and model of IOLs, such as Alcon SN60WF
  4. Biometry method employed, such as Lenstar or IOLMaster

Refractive Vergence Formula

Refractive Vergence Formula Refractive Vergence Formula — R-verg-Hill.xls (Excel)

This Excel spreadsheet contains the refractive vergence formula as outlined in:

Holladay JT: Standardizing constants for ultrasonic biometry, keratometry, and intraocular lens power calculations. J Cataract Refract Surg 1997;23:1356-1370.

The more sophisticated "Holladay R Formula" is recommended and is part of the Holladay IOL Consultant software package.

Correcting for Vertex Distance

IOL Constants Correcting for Vertex Distance — Vertex.xls (Excel)

Be sure to maintain the correct sign (+ or -) when entering the refractive data, or the results will not be accurate.

LENSTAR® User Manual

IOL Constants LENSTAR® User Manual — Lenstar-User-Manual.pdf (Adobe PDF)

This .pdf file contains the "LENSTAR® User Manual" as provided by Haag-Streit-USA.

IOLMaster® Procedures Checklist

IOL Constants IOLMaster Checklist — IOLMaster_checklist.pdf (Adobe PDF)

This .pdf file contains the checklist that our staff uses when measuring the axial length, central corneal power, ACD, and horizontal corneal diameter using the IOLMaster. The .pdf file contains three identical checklists. We suggest having them laminated individually to allow various staff members access to their own copy.

IOLMaster User Manual

IOL Constants IOLMaster Manual — IOLMaster_User_Guide.pdf (Adobe PDF)

This .pdf file contains the "IOLMaster - A Practical Operation Guide" as provided by Carl Zeiss Meditec.

IOL constant optimization

Intraocular Lens Power Calculations

IOL Power Calculations

East Valley Ophthalmology
5620 East Broadway Road
Mesa, Arizona 85206

Tel: +1-480-981-6111
FAX: +1-480-985-2426

Arizona's Top Eye Doctors - East Valley Ophthalmology provides this online information for educational and communication purposes only and it should not be construed as personal medical advice. Information published on this website is not intended to replace, supplant, or augment a consultation with an eye care professional regarding the viewer/user's own medical care. East Valley Ophthalmology's disclaims any and all liability for injury or other damages that could result from use of the information obtained from this site. Please read our full Disclaimer

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