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Surface deposits on worn hard contact lenses
Archives of Ophthalmology (Chicago, Ill. : 1960)
|May 1, 1984
Summary
Giant papillary conjunctivitis (GPC) and keratoconus patients accumulate significant contact lens deposits. While cleaning removes most deposits, residual amounts remain, particularly on lenses from keratoconus patients.
Area of Science:
- Ophthalmology
- Biomaterials Science
Background:
- Giant papillary conjunctivitis (GPC) is linked to contact lens deposits.
- Understanding deposit formation is crucial for contact lens wearers.
Purpose of the Study:
- To analyze and compare deposits on hard contact lenses worn by patients with GPC, keratoconus, and asymptomatic individuals.
- To evaluate the efficacy of cleaning procedures on these deposits.
Main Methods:
- Scanning electron microscopy was used to examine the anterior surfaces of 30 hard contact lenses.
- Lenses were analyzed in both cleaned and uncleaned states from three subject groups.
Main Results:
- Uncleaned lenses from GPC and keratoconus patients showed extensive surface deposits (approx. 90%).
- Cleaning effectively removed most deposits, but residual deposits were higher in keratoconus patients compared to GPC patients.
- Hard contact lenses generally had fewer deposits than soft lenses and deposits were typically removable with one cleaning.
Conclusions:
- Deposit accumulation on hard contact lenses is significantly higher in patients with GPC and keratoconus.
- While cleaning is effective, residual deposits highlight differences in wearers' biological responses.
- Hard contact lens deposits are generally less tenacious than those on soft lenses.