Sains Malaysiana 39(4)(2010): 685–688
Soft Contact Lens Parameter
Changes After using the Lens2¨ Automated Lens Cleaner Machine
(Perubahan
Parameter Kanta Sentuh Lembut Selepas Menggunakan Mesin Pencuci Automatik
Lens2¨)
Haliza Abdul Mutalib* & Kang Chye Lee
Department of Optometry, Faculty of
Allied Health Sciences
Universiti Kebangsaan Malaysia, Jalan
Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
Diserahkan: 11 Jun 2009 / Diterima: 7
Januari 2010
ABSTRACT
Disinfection
of contact lens is an important procedure strongly emphasized by eye care
practitioners. There are several types of disinfecting methods. Some methods
have been proven to induce parameter changes on soft lenses. These parameter
changes are likely to affect the efficacy of contact lens fitting and patients
comfort. A self-controlled trial was carried out on a series of disposable soft
contact lenses of different material to evaluate parameter changes after
cleaning with Lens2¨ (Automated Lens Cleaner Machine). This will be compared to
the lens cleaned conventionally (digital rubbing). Fifty four pieces of soft
contact lenses were divided into 2 groups; cleaned conventionally and with
Lens2¨. Three types of soft contact lenses of different materials were used;
Soflens®38, Focus® Monthly and O2 Optix. Each contact lens was cleaned for 30 times to mimic the
period of 30 days wear. After the thorough cleaning process, the back optic
zone radius (BOZR), back
vertex power (BVP), central
thickness(ct) and total diameter (TD) were measured. The parameters were statistically analysed to
evaluate the changes. There were significant changes in the TD and BVP of
Soflens®38 and O2 Optix with
both methods. The Focus® Monthly contact lens only showed significant BOZR changes with both methods. However, these parameter changes were
not clinically significant because the changes were still in the tolerance
range set by ISO (International
Organization of Standardization). Both cleaning methods proved to maintain lens
parameter within its acceptable range.
Keywords:
Automated Lens Cleaner Machine; Lens2¨; Soft Contact Lens
ABSTRAK
Disinfeksi
kanta sentuh adalah satu prosedur yang sangat penting yang kerapkali ditekankan
oleh pengamal penjagaan mata. Terdapat beberapa kaedah disinfeksi. Sesetengah
kaedah telah dibuktikan boleh menyebabkan perubahan parameter kanta. Kesemua
perubahan parameter akan memberi kesan terhadap pemasangan kanta sentuh dan
keselesaan pemakai. Satu percubaan swakawal telah dijalankan ke atas satu siri
kanta sentuh lembut pakaibuang pelbagai bahan untuk evaluasi perubahan
parameter selepas pencucian dengan menggunakan Lens2¨ (Mesin Pembersih Kanta
Otomatik). Ini akan dibandingkan dengan kanta yang dicuci secara konvensional
(digosok secara digital). Sebanyak lima puluh empat keping kanta sentuh lembut
telah dibahagikan kepada dua kumpulan; dicuci secara konvensional dan dengan
Lens2¨.Tiga jenis kanta sentuh berlainan bahan digunakan; Soflens®38 , Focus®
Monthly dan O2 Optix.
Setiap kanta sentuh dicuci selama 30 kali untuk meniru pemakaian selama 30
hari. Selepas proses pencucian yang rapi , zon optik radius belakang (BOZR), kuasa verteks belakang (BVP), ketebalan tengah(ct) dan diameter total (TD) diukur semula. Parameter yang diukur telah dianalisis secara
statistik untuk menilai perubahannya. Perubahan pada diameter total dan kuasa
vertek belakang bagi Soflens®38 and O2 Optix didapati signifikan untuk kedua-dua prosedur. Kanta sentuh
Focus® Monthly hanya menunjukkan perubahan signifikan pada BOZR bagi kedua-dua kaedah. Walau bagaimanapun, kesemua parameter ini
tidak signifikan secara klinikalnya kerana perubahan parameter yang berlaku
adalah dalam julat yang dibenarkan oleh ISO (International Organization of Standardization).
Kesimpulannya, kedua-dua kaedah pencucian telah membuktikan parameter kanta
dapat dikekalkan dalam julat yang diterima.
Kata kunci:
Kanta sentuh lembut; Lens2®; Mesin Pembersih Kanta Otomatik
RUJUKAN
Boltz, R.L. & Bhoola, H. 1987. Microwave sterilization of
soft contact lenses. 3rd Annual Meeting
of University of Houstan Institute for Contact Lens Research Symposium.
Crabbe, A. & Thompson, P. 2001. Effects of microwave
irradiation on the parameters of hydrogel contact lens. Optometry Vision
Sciences 78: 610-615.
Harris, M.G., Kirby, J.E., Tornatore, C.W. & Wrightnour,
J.A. 1989. Microwave disinfection of soft contact lenses. Optometry Vision
Sciences 66: 82-86.
Harris, M.G., Rechberger, J., Grant, T. & Holdens, B.A.
1990. In-office microwave disinfection of soft contact lenses. Optometry Vision
Sciences 67: 129-132.
Long W.D., Bauman, R.E., Dandridge, R. & Hagmann, P. 1997.
Measured versus labeled parameters of daily disposable contact lenses. International
Contact Lens Clinic 24: 187-197
Mutalib, H.A., Ghazali, A.R. & Ali, N.S. 2008. Protein and
Microbial Determination on worn contact lenses that were cleaned conventionally
and using an automatic lens cleaner, Lens2¨. Malaysian Journal of Health
Sciences 6(1): 11-21.
*Pengarang untuk surat-menyurat; email: haliza@medic.ukm.my
|