87991
document
Regular replacement of extended wear rigid gas permeable contact lenses . PURPOSE While the benefits of planned replacement of soft contact lenses have been investigated , the question of whether there are any clinical benefits to planned replacement of rigid gas permeable ( RGP ) lenses does not appear to have been addressed experimentally . We aimed to determine the benefits of regular replacement of extended wear RGP contact lenses . METHODS We conducted a prospective , single-center , controlled , double-masked study of 39 RGP lens wearers . The subjects were divided into two groups and wore extended wear Quantum 2 lenses ( Dk = 120 ) for 12 months . Subjects in Group I replaced lenses every 3 months , whereas those in Group II were not scheduled to replace their lenses . The integrity of the lenses and the ocular responses to lens wear were monitored in both groups every three months . RESULTS Compared to lenses worn by subjects in Group I , lenses worn by Group II subjects showed significantly more mucous coating , lens binding , and corneal staining over time ( P < 0.05 ; ANCOVA ) . There was no difference in microcystic or tarsal conjunctiva response , lens comfort , refractive change , or visual acuity between the two groups . CONCLUSIONS We advocate that to maintain optimal lens integrity and ocular health , RGP lenses used for extended wear should be replaced every 3 to 6 months .
87992
Intervention_Physical
extended wear rigid gas permeable contact lenses
87993
Intervention_Physical
soft contact lenses
87994
Intervention_Physical
rigid gas permeable ( RGP ) lenses
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Intervention_Physical
regular replacement
87996
Intervention_Physical
extended wear RGP contact lenses
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Intervention_Physical
wore extended wear Quantum 2 lenses
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Intervention_Physical
replaced lenses every 3 months
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Intervention_Other
not scheduled to replace their lenses
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Outcome_Other
integrity of the lenses
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Outcome_Physical
ocular responses
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Outcome_Physical
mucous coating
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Outcome_Physical
lens binding
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Outcome_Physical
corneal staining
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Outcome_Physical
microcystic or tarsal conjunctiva response
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Outcome_Physical
lens comfort
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Outcome_Physical
refractive change
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Outcome_Physical
visual acuity
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Outcome_Physical
optimal lens integrity
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Outcome_Physical
ocular health
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Participant_Condition
extended wear rigid gas permeable contact lenses
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Participant_Condition
single-center , controlled , double-masked study
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Participant_Sample-size
39
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Participant_Condition
RGP lens wearers