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Proper Care and Cleaning of the Microscope
04:57

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Published on: August 11, 2008

Contact lens case cleaning procedures affect storage solution pH and osmolality.

Antonio Abengózar-Vela1, Francisco J Pinto, José M González-Méijome

  • 1Ocular Surface Group, Institute of Ophthalmo-Biology-IOBA, University of Valladolid, Valladolid, Spain. abengozarv@ioba.med.uva.es

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|September 14, 2011
PubMed
Summary

Contact lens case cleaning affects solution pH and osmolality over time. Air drying contact lens (CL) cases increases these values, while lint-free tissue drying (LFTD) results in lower osmolality.

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Published on: August 11, 2008

Development of an In Vitro Ocular Platform to Test Contact Lenses
08:28

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Published on: April 6, 2016

Area of Science:

  • Ophthalmology
  • Materials Science

Background:

  • Contact lens (CL) care involves daily cleaning and storage in specialized cases.
  • The pH and osmolality of storage solutions can be influenced by case hygiene practices.
  • Understanding these changes is crucial for maintaining solution efficacy and ocular health.

Purpose of the Study:

  • To evaluate how different rinsing and drying methods for contact lens (CL) cases impact the pH and osmolality of stored solutions over 30 days.
  • To identify optimal CL case cleaning protocols for maintaining solution parameters.

Main Methods:

  • Four multipurpose solutions and two hydrogen peroxide systems were tested.
  • Contact lens cases underwent daily rinsing (or not) and drying (air drying, lint-free tissue drying, or no drying).
  • Solution pH and osmolality were measured on days 1, 7, 15, and 30.

Main Results:

  • Both pH and osmolality generally increased over 30 days, with an exception for one solution showing decreased pH.
  • Rinsing the case had minimal effect, except for one system showing higher osmolality when unrinsed.
  • Drying methods significantly affected parameters: air drying (AD) led to higher pH and osmolality compared to non-drying (ND) and lint-free tissue drying (LFTD).

Conclusions:

  • Contact lens case cleaning schedules, specifically drying methods, significantly alter solution pH and osmolality over time.
  • Lint-free tissue drying (LFTD) appears to minimize osmolality increases.
  • Further research is needed to correlate these solution parameter changes with bacterial growth, lens performance, and wearer comfort.