What question did this study set out to answer?

This research aims to assess the variability and accuracy of parameters of hydrogel contact lenses as stated by manufacturers.

March 21, 2026

Inter‐Investigator Variability and Validity of Stated Hydrogel Lens Parameters

Key Points

This research aims to assess the variability and accuracy of parameters of hydrogel contact lenses as stated by manufacturers.
Measured lens parameters including front vertex power, overall diameter, base curve, and center thickness.
Utilized the Nikon Projection Vertometer and Hydro-Vue Soft Lens Analyzer for measurements.
Conducted assessments by three masked investigators to reduce bias.
Demonstrated minimal inter-investigator variability in the measured parameters.
Found significant discrepancies between the measured lens parameters and those stated by the manufacturer.

Abstract

This study was designed to determine the variability and validity of various hydrogel contact lens parameters. The front vertex power of the contact lens was measured with the Nikon Projection Vertometer. The contact lens overall diameter, base curve, and center thickness were measured (for 59 hydrogel contact lenses) using the Hydro‐Vue Soft Lens Analyzer, model 1100. These hydrogel lenses were measured by three investigators in a masked comparison. It was demonstrated that the inter‐investigator variability was minimal for the measured lens parameters. However, the measured parameters differed significantly from those stated by the manufacturer.

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Cite This Study

Anderson et al. (Sun,) studied this question.

synapsesocial.com/papers/69be35d76e48c4981c67444a https://doi.org/https://doi.org/10.1002/j.2330-9512.1983.tb00510.x

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