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Pedicle Screw Placement Using an Augmented Reality Head-Mounted Display in a Porcine Model

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Prototype base curve attachment for the topographer: what will replace the vanishing radiuscope?

Keshia S Elder¹, William J Benjamin

¹University of Alabama at Birmingham School of Optometry, 1530 3rd Avenue South, Birmingham, AL 35294-0010, USA. kselder@uab.edu

Optometry (St. Louis, Mo.)

|March 7, 2009

Summary

A novel corneal topographer attachment accurately measures gas-permeable (GP) lens base curves, offering a viable alternative to discontinued radiuscopes for GP lens evaluation.

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Area of Science:

Ophthalmic Optics
Contact Lens Technology
Optical Measurement

Background:

The discontinuation of the radiuscope necessitates new methods for accurate gas-permeable (GP) lens measurement.
Accurate measurement of GP lens base curves is crucial for proper lens fitting and visual acuity.

Purpose of the Study:

To design, manufacture, and validate a novel attachment for corneal topographers.
To evaluate the spherical base curves of GP rigid contact lenses using this new attachment.

Main Methods:

A custom attachment with a front-surface mirror was integrated into a Humphrey Atlas corneal topographer.
The attachment utilized a hemispherical GP lens mount from a radiuscope.
Base curve radii of nine rigid polymer buttons were measured using the attachment, compared to a Neitz Auto CG and Reichert Radiuscope.

Main Results:

No statistically significant difference was found between the measurement methods for base curve radius (P = 0.303).
A statistically significant effect of nominal button radius was observed (P = 0.003).
The mean SimK and Axial radii measured by the attachment were within the accepted tolerance for GP lenses.

Conclusions:

The prototype attachment successfully measured concave GP lens base curve radii without a correction factor.
This demonstrates the clinical feasibility of using a corneal topographer with the developed attachment.
The attachment provides a reliable alternative for evaluating GP lens spherical base curves.