지질이 소수성인 RGP lens의 관리용액인 다목적용액(multipurpose solution, MPS)에서 중요한 요소인 습윤성에 대해 알아보고자 시중에 유통 중인 6개사 제품을 측정 비교해 보았다. 실험에 사용한 MPS는 ALCON의 OPTI-SOAK, CIBA Vision의 SOLO care hard, ALLEKGAN의 Total care, BOSTON의 Simplicity, B&L의 Wetting and Soaking Sol., 그리고 Saehan의 Aquas-multi였으며, 실험방법은 각각에 대해 접촉각과 표면장력, 점도를 측정하였다. 결과는 RGP lens를 8시간 MPS에 담근 후 인공누액을 떨어뜨려 측정한 접촉각은 $25^{circ}{sim}36^{circ}$의 범위로 렌즈와 MPS는 비교적 우수한 습윤성을 보여주었으며, 표면장력은 19.8~31.3 mN/m의 값이 얻어졌다. 각각의 다목적용액에 렌즈를 홀더에 얹은 상태로 계면과 렌즈가 분리될 때의 표면장력을 측정하였을 때는 26.5~33.5mN/m의 값이 측정되었다. 점도는 $4^{circ}C$와 $28^{circ}C$에서 측정했으며 측정온도에 따라 온도가 낮을수록 높게 측정되었고, MPS의 온도 $28^{circ}C$에서 측정했으며 측정온도에 따라 온도가 낮을수록 높게 측정되었고, MPS의 온도 $28^{circ}C$에서 점도는 9.5~65.5 cps를, $4^{circ}C$에서는 6.5~137 cps의 값을 보였다. RGP lens MPS는 soft lens MPS에 비해 접촉각과 표면장력은 낮고, 점도는 높아서 습윤성이 더 우수하였는데 제조회사에 따라 습윤성의 차이가 다소 있었다.
We measured the effect of wettability of six MPSs for RGP lens. The used MPSs(multipurpose solutions) were OPTI-SOAK(ALCON), SOLO care hard(CIBA Vision), Total care(ALLERGAN), Simplicity(BOSTON). Wetting and Soaking Sol.(Bausch & Lomb) and Aquas-multi(Saehan). These MPSs keeps hydrophilic property of lens surface and increase the effect of cleaning or increase the effect of preservative effect. To compare with the effect of wettability we followed the way of contact angle measurement which was general way to measure wettability and compared lens which was conducted by each MPS made by different companies. As a control, 0.9% NaCl solution and artificial tears were used. The degree of the effect of wettability was decided by contact angle. It is hydrophilic property nearby $0^{circ}$ of contact angle and it is closed by hydrophobic property as it increases. To compare with the effect of wettability we followed the way of contact angle measurement which was general way to measure wettability and compared lens which was conducted by each MPS made by different companies. As a control, 0.9% NaCl solution and artificial tears were used. The degree of the effect of wettability was decided by contact angle. It is hydrophilic property nearby $0^{circ}$ of contact angle and it is closed by hydrophobic property as it increases. The results showed that every lens was nearby hydrophilic property within $25^{circ}{sim}36^{circ}$. Also, it was differed by various factors. The surface tension showed various differences between 19.8 and 31.3(mN/m). In the viscosity, MPSs represented the highest viscosity between $4^{circ}C$ and $20^{circ}C$. It was much higher than compared with the viscosity of soft lens MPS. This experiment could be used to grasping the interaction between solutions used to MPS and the natural endowments of lens and to considering the relations of different factors effecting the wettability.
