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Eye Surgery Arizona

  Achieving Accurate
IOL Power Calculations
 
 
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Achieving Accurate IOL Power Calculations.

Cataract surgery has been pushed from a purely medical procedure to one of refractive or "vision correcting" qualities.
Cataract Surgery Arizona
Surgically-induced Astigmatism Calculator

Surgically-induced Astigmatism Calculator

Now, there is no need to delve into mathematics. The SIA Calculator removes the task of drawing vectors or looking up sines, cosines and their relatives. Just push a few keystrokes and the job is accurately and speedily done.
Surgically-induced Astigmatism Calculator (SIA Calculator)

Surgically-induced Astigmatism Calculator
Haigis Formula Optimization

Haigis Formula Optimization

Rather than simply move a fixed formula-specific IOL power prediction curve up (more IOL power recommended) or down (less IOL power recommended), the Haigis formula instead uses three constants.
Haigis Formula Optimization Spreadsheet

Haigis Formula Optimization Spreadsheet
4-IOL Constants

Optical Biometry Lens Constants

Because there is no corneal contact, optical biometry lens constants will always be higher than those optimized for applanation A-scans in which there is a variable amount of corneal compression. Read more...
Optical Biometry Lens Constants

IOL Calculation
	Formulas

Optical Biometry

Precise biometry is essential for accurate outcomes in cataract and refractive surgeries. The measurement of axial length by ultrasound was the gold standard for many years.


LenStar Tutorials


IOLMaster Tutorials


Precise biometry is essential for accurate outcomes in cataract and refractive surgeries. The measurement of axial length by ultrasound was the gold standard for many years. Read more...

IOLMaster
Best Techniques for Axial Length Measurements ALM

Best Techniques for Axial Length

Measuring axial length with the IOL Master allows a high degree of flexibility. Rather than simply positioning a small, in-focus image in the middle of a set of video screen cross hairs, you can instead maneuver the focusing spot anywhere within the measurement reticule.
Best Techniques for Axial Length

Best Techniques for Axial Length Measurements ALM
Keratometer Measurement

Keratometer Measurement

Very often, the described problems can be traced down to keratometer indices and/or to peculiarities of corneal power implementations in the IOL formulas of the respective instruments. Keratometer Measurement

Keratometer Measurement
IOL Power Formulas

IOL Power Formulas

If you have not done so already, now is the time to incorporate one of the newer theoretic IOL formulas. Follow this link for comparisons of the various IOL power formulas in current use: IOL Power Formulas

IOL Power Formulas
A-scan Biometry

A-scan Biometry

A-Scan Biometry using ultrasound, an important and sometimes challenging preoperative measurement, can be carried out in several ways. In this section, we will compare the advantages of the immersion technique over applanation, and how to improve accuracy.
A-Scan Biometry Using Ultrasound

A-scan Biometry
IOL Power after LASIK, PRK, RK

IOL Power after LASIK, PRK, RK

Prior keratorefractive surgery will make direct measurements for corneal power problematic. Learn how to to estimate the true corneal power following RK, PRK, and LASIK. IOL Power after LASIK, PRK, RK

IOL Power after LASIK, PRK, RK
Cataract Surgery Arizona

 

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Cataract Surgery Arizona

Intraocular Lens Power Calculations
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Intraocular Lens Power Calculations

Zeiss IOLMaster User Manual


East Valley Ophthalmology, Arizona's premier eye specialists, provides this on-line 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