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Related Experiment Videos

Parameter consistency in disposable lenses

R E Gundel1, J S Rosen, E N Kaplan

  • 1Contact Lens Research Group, State College of Optometry, State University of New York, New York.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1993
PubMed
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Johnson & Johnson Acuvue lenses exhibited greater diameter variation and more edge defects than Wesley-Jessen FreshLook lenses, potentially increasing fracture risk. This study highlights manufacturing inconsistencies in disposable contact lenses.

Area of Science:

  • Ophthalmology
  • Materials Science
  • Biomedical Engineering

Background:

  • Disposable contact lenses are widely used for vision correction.
  • Manufacturing inconsistencies can affect lens performance and patient safety.
  • Premature lens fracture is a potential complication of contact lens wear.

Purpose of the Study:

  • To evaluate parameter consistency and identify edge defects in two types of disposable contact lenses.
  • To assess the potential relationship between these factors and premature lens fracture.
  • To compare Johnson & Johnson Acuvue lenses with Wesley-Jessen FreshLook lenses.

Main Methods:

  • Measurement of lens diameter and back surface sagittal depth for 50 Acuvue and 50 FreshLook lenses.
  • Assessment of center thickness across a range of powers (-0.50 to -4.00 D).

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  • Visual inspection for edge defects that could compromise lens integrity.

    • Main Results:

    • Acuvue lenses showed greater diameter variation (13.97-14.48 mm) compared to FreshLook (14.30-14.63 mm).
    • Acuvue lenses exhibited more significant center thickness variations at low minus powers.
    • Edge defects were found in 44% of Acuvue lenses versus 12% of FreshLook lenses.

    Conclusions:

    • Significant manufacturing variations and a higher prevalence of edge defects in Acuvue lenses suggest a greater risk of premature fracture.
    • FreshLook lenses demonstrated better parameter consistency and fewer defects.
    • Quality control in disposable contact lens manufacturing is crucial for ensuring lens integrity and patient safety.