Boost Maureen, Poon Kin-Chiu, Cho Pauline
Department of Health Technology, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
Optom Vis Sci. 2011 Dec;88(12):1409-13. doi: 10.1097/OPX.0b013e3182346616.
This study investigated contamination of saline and daily disposable contact lens (DDCL) stored overnight after use in the original blister pack and the practices of a group of DDCL users.
Twenty DDCL wearers placed their lenses after 1 day's use back into the blister pack saline (BPS) and left them overnight before transferring both lens and BPS to a new CL case. The lens and BPS were cultured the following day, and total number of organisms, Staphylococci, and gram negative organisms enumerated. Each subject submitted five pairs of lenses over a 1 month period.
Ninety-five percent of subjects had at least one pair of contaminated lenses, and the BPS yielded similar results to the contaminated lenses, with staphylococcal contamination being predominant. Three subjects admitted to not washing their hands before handling their lenses and six to habitual reuse of their lenses with storage in the BPS. There was a higher risk of contamination in male subjects.
Reuse of lenses poses an important risk for DDCL users because they are unlikely to have received proper training in cleaning and disinfection of lenses and do not use a lens case or disinfecting solutions. Overnight storage in BPS results in contaminated lenses which if reused increases the infection risk especially with Staphylococci. It is important that practitioners carefully educate their patients in correct use of DDCL and, as cost of lenses is a major factor in willingness to reuse, ensure that DDCL is the most suitable choice when prescribing.
本研究调查了使用后的日抛型隐形眼镜（DDCL）在原泡罩包装中过夜储存后的生理盐水污染情况以及一组DDCL使用者的行为习惯。
20名DDCL佩戴者在使用1天后将镜片放回泡罩包装生理盐水中（BPS），放置过夜，然后将镜片和BPS转移到一个新的隐形眼镜盒中。次日对镜片和BPS进行培养，统计微生物总数、葡萄球菌和革兰氏阴性菌数量。每位受试者在1个月内提交5副镜片。
95%的受试者至少有一副镜片被污染，BPS的污染情况与被污染镜片相似，以葡萄球菌污染为主。3名受试者承认在处理镜片前未洗手，6名受试者习惯将镜片重复使用并储存在BPS中。男性受试者的污染风险更高。
镜片重复使用对DDCL使用者构成重要风险，因为他们不太可能接受过镜片清洁和消毒的适当培训，也不使用隐形眼镜盒或消毒溶液。在BPS中过夜储存会导致镜片被污染，如果重复使用会增加感染风险，尤其是葡萄球菌感染。从业者务必认真对患者进行正确使用DDCL的教育，并且由于镜片成本是影响重复使用意愿的主要因素，在开处方时要确保DDCL是最合适的选择。
