What question did this study set out to answer?

This analysis aims to measure and inspect the parameters of hydrophilic contact lenses from different manufacturers.

March 21, 2026

Measured and Laboratory‐Stated Parameters of Hydrophilic Contact Lenses

Key Points

This analysis aims to measure and inspect the parameters of hydrophilic contact lenses from different manufacturers.
Random selection of 131 hydrophilic lenses from an optometry clinic
Measurement of base-curve dimensions, power specifications, central thickness, and overall diameter
Inspection for surface scratches and defects
Approximately 60% of lenses had base-curve specifications within specified ranges.
More than 65% of lenses were within 0.25 D of the power specification.
Two-thirds of lenses met central thickness and diameter specifications within 0.04 mm and 0.40 mm, respectively.
Most lenses exhibited surface and edge defects.

Abstract

ABSTRACT One hundred thirty‐one new hydrophilic lenses made by 3 manufacturers were randomly selected from an optometry clinic for measurement and inspection. Approximately 60% of the base‐curve specifications fell within the following ranges for the measured dimensions: Bausch Milton Roy Naturvue® lenses, <0.375 mm; Soft Lens Inc. Hydrocurve®, <0.225 mm. More than 65% of the lenses supplied by all the manufactures were within 0.25 D of the power specification. About two‐thirds or more of all lenses had a central thickness and overall diameter within 0.04 mm and 0.40 mm, respectively, of the manufacturers' specifications, although there were notable differences among manufacturers. Most of these new lenses exhibited surface scratches and other surface defects, and many lenses had edge defects.

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