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1 ISSN(print) (3): , September 2017 < 초청논문 > Evaluation for Surficial and Internal Hydrophilicity of Soft Contact Lenses Hye Lim Park 1, Shin Jang Cheol 2, So Ra Kim 1, and Mijung Park 1, * 1 Dept. of Optometry, Seoul National University of Science and Technology, Seoul 01811, Korea 2 Dept. of Optometry, Busan Institute of Science and Technology, Busan 46639, Korea (Received August 11, 2017: Revised August 29, 2017: Accepted September 1, 2017) Purpose: The aim of this study was to investigate the difference between the surficial and internal hydrophilicity of soft contact lenses (hereinafter soft lenses) due to the presence or absence of wetting agents and dyes. Methods: The surface and interior of 9 types of soft lenses available in the domestic market were stained with Sudan IV solution according to the modified Jacob method. The degree of hydrophilicity was determined by the converted concentration from the absorbance of Sudan IV extract obtained from the lenses according to the calibration curve. Results: The hydrophilicity of the soft lenses was improved five times and more by the inclusion of wetting agent, and the improvement degree of the hydrophilicity was varied depending on the type of soft lenses. Depending on the presence or absence of dyes, the degree of hydrophilicity of the surface and interior of the soft lenses was changed, and the hydrophilicity of the surface and the interior was influenced by the location of dye. Conclusions: From the present study, it was revealed that wetting agents and dyes affect the surface and internal hydrophilicity of soft lenses. Thus, the effect on hydrophilic properties may affect various material properties of soft lenses as well as comfortness. Key words: Soft contact lens, Surficial hydrophilicity, Internal hydrophilicity, Wetting agent, Tint 서론 2015년에시행된한국갤럽의조사에따르면 1990년대 3% 대였던콘택트렌즈사용률은현재전체인구의 7.1% 로 2배이상증가하였다. [1] 최초에는시력교정및의료용으로만사용되었으나미용목적의써클소프트콘택트렌즈 ( 이하써클렌즈 ) 도보편화되면서콘택트렌즈사용인구가늘어남과동시에콘택트렌즈착용자의나이가어려지고있는추세이다. [2] 그러나콘택트렌즈착용자의일부는건조감, 충혈, 이물감등의이유로렌즈착용을중단하기도한다. [3-5] 콘택트렌즈는눈물막사이에위치하면서눈물과긴밀한상호작용을하게되는데, 재질에따라다양한눈물속의단백질, 지질, 칼슘등이부착되는양상을보인다. [6] 이러한침전물들이시간이지나변성을일으키게되면착용감에좋지않은영향을줄뿐만아니라심한경우결막유두, 상안검결막충혈및윤부충혈등과같은안과질환을일으키기도한다. [3] 이러한사용자의불편함과부작용을감소시키고자제조사에서는콘택트렌즈의착용주기를짧게하여위생적인부분의문제를해결하고, 재질의산소투과성과습윤 성을높이는등여러불편감을해소하기위해노력을기울이고있다. 현재착용감을보는척도는주로접촉각측정을통해콘택트렌즈의습윤성을평가하는데, [7] 실제콘택트렌즈착용시눈물막안에콘택트렌즈가존재하기때문에재질의전체적인습윤성이중요하다. [6] 콘택트렌즈는제조방식마다표면처리방식이다르고, 하나의렌즈에서도부분별표면의거칠기나착색유무등의차이점이있으나 [8,9] 전체적인표면친수성에대한평가가미미한실정이다. Jacob 등 [10] 은선행연구를통해수단 (Sudan) IV 용액으로실리콘하이드로겔콘택트렌즈의표면과내부를염색하여각콘택트렌즈의표면및내부의소수성정도를비교한바있다. 이방법은접촉각측정만으로콘택트렌즈의습윤성을평가한기존의연구에서진일보하여표면뿐만아니라내부의습윤성까지도비교평가할수있다는장점이있다. 콘택트렌즈에습윤제를함유시키거나표면처리를하여습윤성을증가시키기도하지만콘택트렌즈의습윤성을저하시키는요인들도존재한다. 그중에하나가눈물성분의침착이며특히눈물단백질이침착된소프트렌즈는습윤성저하, 착용감저하, 시력저하, 염증질환유발, 세균감 *Corresponding author: Mijung Park, TEL: , mjpark@seoultech.ac.kr 본논문의일부내용은 2017년도한국안광학회하계학술대회에서포스터로발표되었음. 213

2 214 Hye Lim Park, Shin Jang Cheol, So Ra Kim, and Mijung Park 염유발및렌즈의변색등여러가지부작용의원인이된다고알려져있다. [11] 콘택트렌즈에침전되는단백질은크기가다양하여일부단백질의경우재질내부로침전되기도한다. [12] 표면및내부에침착된단백질은침착시간이경과됨에따라변성되며, 지방질및칼슘과결합하여시력을방해할수있고, 렌즈파라미터의변화를일으켜사용자의피팅상태에영향을주기때문에사용자의착용감과안구건강에영향을줄수있다. [13] 또한, 써클렌즈의경우투명소프트콘택트렌즈 ( 이하투명렌즈 ) 와동일한재질이라하더라도착색을위해첨가되는염료의물성에의해투명렌즈와는다른물성을가질수있으며, 착색공법중샌드위치공법과같이염료가내부에위치해있거나표면에염료가있더라도캡슐레이션을하는경우가있어착색유무에따라표면및내부의친수성이달라질가능성이크다. [14] 염료외에도산소투과나착용감을위해렌즈내부재질에변형을가하거나습윤인자를첨가하여소프트렌즈의기능을향상시킨렌즈들의경우는일반적으로알고있는모노머만의특성만으로소프트렌즈표면및내부의특성이결정되지않게된다. [9,15] 따라서본연구는소프트렌즈표면과내부의친수성을정량적으로제시하여소프트렌즈재질의특성을이해하는데목적이있다. 이에시중에서쉽게구할수있는소프트렌즈의친수성을평가하여재질종류, 습윤제유무, 착색유무및위치에따라표면및내부의친수성이어떻게달라지는지를알아보고자하였다. 대상및방법 1. 대상국내시판중인일일착용콘택트렌즈 (daily disposable contact lens) 9종을대상으로하였다. 재질이동일하며, 습윤제함유여부혹은착색여부가다른소프트렌즈군으로분류하였으며 etafilcon A 재질이면서투명렌즈 (EC 렌즈 ), 습윤렌즈 (ECP 렌즈 ), 써클렌즈 (ET 렌즈 ), 습윤제함유써클렌즈 (ETP 렌즈 ) 와 hilafilcon B 재질의투명렌즈 (HC 렌즈 ), 써클렌즈 (HT 렌즈 ), 그리고 nelfilcon A 재질의투명렌즈 (NC 렌즈 ), 습윤렌즈 (NCP 렌즈 ), 써클렌즈 (NT 렌즈 ) 를사용하였다. Etafilcon A 재질렌즈에함유된습윤제는 polyvinylpyrrolidone(pvp) 이었으며, nelfilcon A 재질렌즈에함유된습윤제는 PEG(polyethylene glycol) 와 HPMC(hydroxypropyl methylcellulose) 이었다 (Table 1). 2. 친수성측정방법수정된 Jacob 등 [10] 의방법에따라수단 IV 용액을제조하였다. 2.0 g의수단 IV 파우더 (Sigma Aldrich, Inc, MO, USA) 와실리콘오일 (200F-1000CS, 새한실리켐사, Seoul, Korea) 96.3 g을자기교반기 (LMS-1003, Dai-han, Korea) 를이용해 30분동안교반한후, 원심분리기 (Z300, Hermile- Labortechnik, Germany) 를이용하여 6000 rpm의속도로 40분간원심분리한침전물에실리콘오일을첨가하여 60 ml의수단 IV 용액을제조하였다. 5 ml의수단 IV 용액에 Table 1. Properties of soft contact lenses used in this study Lens EC ECP ET ETP HC HT NC NCP NT Manufacturer Johnson&Johnson Bausch+Lomb Alcon USAN etafilcon A hilafilcon B nelfilcon A Clear or Circle(tinted) Clear Circle Clear Circle Clear Circle Replacement schedule (day) Water contents (%) Center thickness (mm) Total diameter (mm) Base curve (mm) Dk/t FDA Group category IV II II Monomer MA MA, PVP MA MA, PVP NVP NVP PVA PVA, HPMC, PEG PVA EC: etafilcon A clear, ECP: etafilcon A clear with PVP, ET: etafilcon A tinted, ETP: etafilcon A tinted with PVP, HC: hilafilcon B clear, HT: hilafilcon B tinted, NC: nelfilcon A clear, NCP: nelfilcon A clear with PEG, NT: nelfilcon A tinted, HEMA: hydroxyethyl methacrylate, MA: methacrylate, PVP: poly-vinyl pyrrolidone, NVP: n-vinyl pyrrolidinone, PVA; poly-vinyl alcohol, HPMC: hydroxypropyl methylcellulose, PEG: poly-ethylene glycol United States Adopted Name Oxygen transmissibility, Dk/t 10 9 (cm/sec)(mlo2 ml mmhg)

3 Evaluation for Surficial and Internal Hydrophilicity of Soft Contact Lenses 215 렌즈를 1개씩넣고실온에서왕복식진탕기 (CR300, FINEPCS, Korea) 를이용하여 50 rpm의속도로 30분또는 16시간진탕하면서렌즈를염색하였다. 염색된렌즈를인산완충용액 (phosphate buffer saline, ph 7.4, 0.1 M) 4 ml를이용하여 2번헹군후, DMSO(dimethyl sulfoxide) 1 ml에넣고실온에서초음파추출기 (SD-350H, 성동초음파, 대한민국 ) 에서 45분동안수단 IV 염료를용출시킨후용출염료를마이크로플레이트리더 (FLx800, BioTek, USA) 를이용하여 522 nm에서흡광도를측정하였다. 흡광도검량선에따라수단 IV의농도 (µg/lens) 를구하였다. Jacob 등 [10] 의방법에서와마찬가지로 30분염색시의농도를렌즈의 표면 친수성, 16시간염색시의농도를렌즈의 전체 ( 내부 + 표면 ) 친수성으로판정하였으며 내부 친수성전체값에서표면값을뺀계산값을사용하였다. 용출된수단 IV의농도가낮을수록친수성이더큰것으로평가하였다. 3. 통계처리모든실험은 2회이상반복실험하였으며실험결과는평균 ± 표준편차로나타냈다. 표면과내부의습윤제함유여부및착색유무에따른친수성평가의통계적유의성은독립표본 T 검정, 동일재질소프트렌즈간의표면및내부에대한친수성평가는대응표본 T 검정을사용하였으며, p<0.05인경우에유의성이있다고판정하였다. Fig. 2. The surficial and internal hydrophilicity of ECP lens. 의해친수성이향상되었다 (Fig. 1과 2). Etafilcon A 써클렌즈의친수성평가에서전체친수성은 ET 63.6 µg/lens, ETP 12.3 µg/lens로통계적으로유의한차이가있었다 (p = 0.000). 표면의친수성은 ET 13.3 µg/ lens, ETP 3.3 µg/lens로통계적으로유의한차이가있어 PVP 습윤제가렌즈표면의친수성에영향을미친것으로나타났다 (p = 0.002). 내부의친수성은 ET 50.3 µg/lens, ETP 9.0 µg/lens로내부친수성이 5.6배높았다. Etafilcon A 써클렌즈에서도 PVP 습윤제에의한친수성향상을확인하였다 (Fig. 3과 4). Nelfilcon A 투명렌즈의친수성평가에서전체의친수성은 NC 0.98 µg/lens, NCP 0.84 µg/lens로통계적으로유의 결과및고찰 1. 습윤제함유여부에따른친수성평가 Etafilcon A 재질렌즈의친수성평가에서전체의친수성은 EC 33.4 µg/lens, ECP 14.9 µg/lens로통계적으로유의한차이였고 (p = 0.023), 표면의친수성은 EC 10.8 µg/ lens, ECP 10.0 µg/lens로통계적으로유의한차이는아니었다 (p = 0.227). 내부의경우는 EC 22.6 µg/lens, ECP 4.9 µg/lens로습윤제가들어있는렌즈가 4.6배친수성이큰것으로나타났다. Etafilcon A 투명렌즈의경우습윤제에 Fig. 3. The surficial and internal hydrophilicity of ET lens. Fig. 1. The surficial and internal hydrophilicity of EC lens. Fig. 4. The surficial and internal hydrophilicity of ETP lens.

4 216 Hye Lim Park, Shin Jang Cheol, So Ra Kim, and Mijung Park Fig. 5. The surficial and internal hydrophilicity of NC lens. Fig. 7. The surfacial and internal hydrophilicity of HC lens. Fig. 6. The surficial and internal hydrophilicity of NCP lens. Fig. 8. The surficial and internal hydrophilicity of HT lens. 한차이는아니었고 (p = 0.468), 표면의친수성은 NC 0.12 µg/lens, NCP 0.13 µg/lens로통계적으로유의한차이는아니었다 (p = 0.791). 또한내부의친수성은 NC 0.86 µg/ lens, NCP 0.71 µg/lens로 1.2배더큰것으로나타났으나, nelfilcon A 재질렌즈의경우는습윤제가함유된렌즈와함유되지않은렌즈모두친수성이커서친수성차이가크지않았다 (Fig. 5와 6). 2. 착색유무에따른친수성평가 Etafilcon A 재질렌즈의친수성평가에서전체친수성은 EC 33.4 µg/lens, ET 63.6 µg/lens로통계적으로유의한차이가있었고 (p = 0.008), 표면의친수성은 EC 10.8 µg/lens, ET 13.3 µg/lens로투명렌즈의친수성이더높았으나통계적으로유의한차이는아니었다 (p = 0.268). 내부의경우는 EC 22.6 µg/lens, ET 50.3 µg/lens로투명렌즈의친수성이 2.2배높았다 (Fig. 1과 4). 습윤제를포함한 etafilcon A 재질렌즈의친수성은전체의경우 ECP 14.9 µg/lens, ETP 12.3 µg/lens로통계적으로유의한차이는아니었고 (p = 0.348), 표면은 ECP 10.0 µg/lens, ETP 3.3 µg/ lens로통계적으로유의한차이를보였다 (p = 0.000). 내부친수성은 ECP 4.9 µg/lens, ETP 9.0 µg/lens로투명렌즈의친수성이 1.8배더높은것으로나타났다 (Fig. 2와 4). Hilafilcon B 재질렌즈의친수성평가에서전체친수성 Fig. 9. The surficial and internal hydrophilicity of NT lens. 은 HC 66.7 µg/lens, HT 63.3 µg/lens로통계적으로유의한차이는아니었고 (p = 0.633), 표면의친수성은 HC 12.3 µg/lens, HT 21.4 µg/lens로통계적으로유의한차이였고 (p = 0.005) 투명렌즈의표면친수성이 1.7배높은것으로나타났다. 반면내부친수성은 HC 54.4 µg/lens, HT 41.9 µg/lens로써클렌즈의친수성이 1.3배더높은것으로나타났다 (Fig. 7과 8). Nelfilcon A 재질렌즈의전체친수성은 NC 0.98 µg/ lens, NT 1.39 µg/lens(p = 0.072), 표면의친수성은 NC 0.12 µg/lens, NT 0.13 µg/lens(p = 0.439) 로통계적으로유의한차이는아니었다. 내부친수성은 NC 0.86 µg/lens, NT 1.26 µg/lens로전체, 표면, 내부에서투명렌즈친수성

5 Evaluation for Surficial and Internal Hydrophilicity of Soft Contact Lenses 217 이더높았다 (Fig. 5와 9). 본연구에서착색유무와상관없이습윤제인 PVP를포함한 etafilcon A에서표면및내부친수성이우수한것으로나타났다. 투명렌즈와착색렌즈에서정도의차이는있었으나 PVP가재질의표면및내부모두의친수성에영향을끼치는것으로나타나, PVP를포함한렌즈의경우상대적으로습윤성이높다는것을알수있었다. 최근 etafilcon A 재질써클렌즈의염료위치에대한연구에서주사전자현미경을사용한써클렌즈의수직단면촬영결과 BWIC(beauty-wrapped-in-comfort) 공법으로제조한 ET 와 ETP 렌즈는재질내부에염료가존재한다는것을확인한바있다. [16] 본연구의결과에의하면 EC와 ET 렌즈의표면친수성이차이가있었으나통계적으로유의할정도의차이는아닌반면내부포함친수성은투명렌즈가약 1.9배더높았다. 이러한결과는재질내에위치한염료가내부친수성에영향을미친것으로유추해볼수있었다. Hilafilcon A 재질의써클렌즈는주사전자현미경으로수직단면을촬영하였을때염료가렌즈표면에위치함이확인된바있다. [16] 본연구에서 hilafilcon A 재질투명렌즈의표면친수성이써클렌즈에비해 1.7배더높았으며, etafilcon A 재질렌즈와마찬가지로염료에의해친수성이영향을받은것으로생각된다. 습윤제함유유무에따른친수성평가에서습윤제가함유되지않은써클렌즈인 ET의경우표면 13.3 µg/lens, 내부포함 63.6 µg/lens이었고, 습윤제가함유된써클렌즈인 ETP의경우표면 3.3 µg/lens, 내부포함 12.3 µg/lens였다. ET는내부의경우 50.3 µg/lens, ETP는 9.0 µg/lens으로 PVP가없는써클렌즈의표면과내부의친수성차이가더큰것으로나타났다. ET는써클렌즈의염료가친수성정도에차이를유발할수있다는결과에부합하였으나, ETP 는그차이가미미하였다. 이는렌즈재질내에존재하는 PVP가염료로인한소수성화를상쇄시켜서나타난결과로보인다. 써클렌즈에사용되는염료는물및유기용제에녹지않는분말상의착색제로일반적으로소수성을나타내고, 이로인해렌즈의습윤성을저하시킨다고보고된바있다. [17] 본연구에서는염료의위치에의해서도표면과내부의친수성이영향을받을수있다는것을확인하였다. Nelfilcon A 재질렌즈의경우는습윤제가함유되지않은투명렌즈가다른재질소프트렌즈보다친수성이크게좋았으며, 습윤제함유여부가표면및내부모두의친수성에영향을미치지않았다. 또한, 표면에염료가침착되어있는 nelfilcon A 재질써클렌즈역시친수성에차이가없어렌즈재질에따라서습윤제함유여부및착색여부에의한친수성의변화가달라짐을확인할수있었다. [8] 본연구에서동일렌즈재질간의습윤제함유여부및 착색여부에따른습윤성비교는습윤성및착색여부만을제외하고는다른파라미터가동일하였기때문에가능한것이다. 재질이다른소프트렌즈간에는렌즈디자인이나중심두께등에따라수단 IV의흡수양이다를수있기때문에소프트렌즈재질에따른비교는오차가존재할것으로보인다. 콘택트렌즈표면및내부의단백질침착에대한 Garrette 등 [12] 과이등 [13] 의선행연구결과에서눈물속에존재하는단백질이콘택트렌즈의표면에만침착되는것이아니라, 상대적으로크기가작은단백질의경우렌즈재질을관통하여침착될수있다고하였다. 또한 FDA Group Ⅳ 로분류되는하이드로겔콘택트렌즈에라이소자임을침착시킨결과, 표면침착량보다는적었지만내부침착도발견되었으며, 알부민의경우에도내부침착도발생했다고하였다. [12,18,19] 이렇게렌즈재질을관통하는단백질의경우, 재질내부의성질이단백질흡착에영향을줄것으로본다. 노 [20] 의연구에의하면 PVP를 HEMA에공중합한경우 PVP의영향으로친수성이강화되었다고하였고, 그영향으로알부민의흡착량이미미하게적었으며습윤성이증가함에따라알부민의흡착량이점차감소하였다고하였다. 이는콘택트렌즈표면의연구에국한된것이지만, 습윤성이단백질흡착에영향을줄수있다는의미로해석할수있을것이다. 이등 [15] 의연구에서 HEMA 재질에 PVP를첨가하였을때 PVP 함량에따라습윤성이점차증가하는것을증명한바있다. 본실험에서사용한 ECP, ETP는렌즈재질내에 PVP가존재하기때문에내부습윤성에영향을줄수있을것으로보인다. 또한 HT는표면에염료가위치하기때문에표면습윤성에, ET와 ETP의경우는렌즈내부에염료가위치함에따라내부습윤성에영향을줄것이다. 따라서콘택트렌즈의내부의습윤성정도에따라서가용성단백질의흡착량이달라질수있을것이며, etafilcon A 재질의 PVP는렌즈재질내의습윤성을높이고, 염료는습윤성을낮춰가용성단백질의흡착에영향을줄수있을것으로사료된다. 결론본연구에서는시중에판매중인소프트렌즈의표면및내부의친수성을정량적으로평가하여재질의특성을이해하고자하였다. Etafilcon A 재질투명렌즈의경우습윤제가표면의친수성보다내부친수성에더큰영향을미치는것으로나타났으며, 써클렌즈의경우는표면과내부모두습윤제가함유된렌즈의친수성이더높은것으로나타났다. Nelfilcon A 렌즈의경우표면및내부모두친수성이매

6 218 Hye Lim Park, Shin Jang Cheol, So Ra Kim, and Mijung Park 우높아습윤제함유여부, 착색유무및염료의위치에의한차이가크지않았다. 샌드위치공법으로염료가내부에존재하는 etafilcon A 재질써클렌즈는투명렌즈와전체친수성비교시투명렌즈의친수성이써클렌즈보다 1.9배높았다. 반면렌즈표면에염료가위치한 hilafilcon B 재질은써클렌즈와투명렌즈의전체친수성은유의한차이는없었으나, 표면의친수성은투명렌즈가 1.7배높고, 내부의친수성은써클렌즈가 1.3배높았다. 본연구에서습윤제함유여부및착색유무에따라소프트렌즈의친수성이달라질수있음을밝혔으며, 친수성의향상정도는소프트렌즈재질에따라정도의차이가있음을알수있었다. 본연구를통하여습윤제및염료가콘택트렌즈표면및내부특성에미치는영향을정량적으로제시하였으며이러한결과는콘택트렌즈착용으로인한착용감, 눈물성분침착정도의차이및각막에대한생리적인상호작용에직간접적인영향을미칠것으로보인다. 기술개발을거듭하는현대의소프트렌즈는표면및내부를다양하게변화시키면서사용자의요구사항을충족시키고있다. 본연구를통한소프트렌즈의표면과내부의친수성에대한이해는사용자의건강하고편안한콘택트렌즈사용에도움을줄것으로기대한다. REFERENCES [1] Korean Optometric Association. Gallup Korea: National glasses utilization, eopticnews.asp?nmode=view&onsseq=2570&search_what =&keyword=&search_type=4&page=4(15 November 2016). [2] Lee JH, Lee KS, Chu BS. Contact lens prescribing pattern in Korean during 2010 to J Korean Ophthalmic Opt Soc. 2014;19(3): [3] Dong EY, Kim E. Result of population-based questionnaire on the symptoms and lifestyle associated with contact lens. J Korean Ophthalmol Soc. 2001;42(1): [4] Pritchard N, Fonn D, Brazeau D. Discontinuation of contact lens wear: a survey. Int Contact Lens Clin. 1999; 26(6): [5] Richdale K, Sinnott LT, Skadahl E, Nichols JJ. Frequency of and factors associated with contact lens dissatisfaction and discontinuation. Cornea. 2007;26: [6] Maki KL, Ross DS. Exchange of tears under a contact lens is driven by distortions of the contact lens. Integr Comp Biol. 2014;54(6): [7] Menzies KL, Jones L. The impact of contact angle on the biocompatibility of biomaterials. Optom Vis Sci (6): [8] Park SH, Kim SR, Park M. Relationship between the deposition of tear constituents and the adherence of Candida albicans according to soft contact lens materials and pigmentation. 2016;21(3): [9] Ji YW, Cho YJ, Lee CH, Hong SH, Chung DY, Kim EK et al. Comparison of surface roughness and bacterial adhesion between cosmetic contact lenses and conventional contact lenses. Eye Contact Lens. 2015;41(1): [10] Jacob JT, Levet J Jr, Edwards TA, Dassanayake N, Ketelson H. Visualizing hydrophobic domains in silicone hydrogel lenses with Sudan IV. Invest Ophthalmol Vis Sci. 2012; 53(7): [11] Ju EH, Sung AY, Oh SJ, Lee KJ. The effect of protein deposit on water content, oxygen transmissibility and contact angle of the soft contact lens. Korean J Vis Sci. 2010;12(4): [12] Garrett Q, Garrett RW, Milthorpe BK. Lysozyme sorption in hydrogel contact lenses. Invest Ophthalmol Vis Sci. 1999;40(5): [13] Lee JY, Lee JI, Kim SR, Park M. Correlation between tear proteins deposition and oxygen transmissibility of soft contact lenses. 2017; 22(2): [14] Kim SR, Kang U, Seo BM, Park M. A study on dye elution from the circle contact lenses. J Korean Ophthalmic Opt Soc. 2014;19(2): [15] Lee MJ, Sung AY, Kim TH. Influence of wetting agents on physical properties of soft contact lens. J Korean Ophthalmic Opt Soc. 2014;19(1): [16] Lorenz KO, Kakkassery J, Boree D, Pinto D. Atomic force microscopy and scanning electron microscopy analysis of daily disposable limbal ring contact lenses. Clin Exp Optom. 2014;97(5): [17] Kim TH, Ye KH, Sung AY. Study on the wettability of cosmetic color contact lens. Korean J Vis Sci. 2010;12(2): [18] Heynen M, Babaei Omali N, Fadli Z, Coles-Brennan C, Subbaraman LN, Jones L. Selectivity and localization of lysozyme uptake in contemporary hydrogel contact lens materials. J Biomater Sci Polym Ed. 2017;28(13): [19] Luensmann D, Glasier MA, Zhang F, Bantseev V, Simpson T, Jones L. Confocal microscopy and albumin penetration into contact lenses. Optom Vis Sci. 2007;84(9): [20] Noh HR. Interfacial and rheological properties of selected hydrogel formulations for soft contact lens. Polym Korea. 2012;36(2):

7 Evaluation for Surficial and Internal Hydrophilicity of Soft Contact Lenses 219 소프트콘택트렌즈의표면및내부친수성평가 박혜림 1, 신장철 2, 김소라 1, 박미정 1, * 1 서울과학기술대학교안경광학과, 서울, 부산과학기술대학교안경광학과, 부산, 투고일 (2017 년 8 월 11 일 ), 수정일 (2017 년 8 월 29 일 ), 게재확정일 (2017 년 9 월 1 일 ) 목적 : 습윤제함유유무및착색유무에의한소프트콘택트렌즈 ( 이하소프트렌즈 ) 의표면및내부친수성의차이를알아보고자하였다. 방법 : 국내에시판중인 9 가지종류의소프트렌즈의표면및내부를수정된 Jacob 의방법에따라수단 IV 용액으로염색하였다. 렌즈에흡착된수단 IV 추출액의흡광도를검량선에따라농도로환산하여친수성정도를판단하였다. 결과 : 습윤제함유에의해소프트렌즈의친수성이 5 배이상향상되는경우가있으며, 친수성의향상정도는소프트렌즈에따라차이가있었다. 착색유무에따라소프트렌즈표면과내부친수성의정도가달라질수있으며, 염료의위치에의해서도표면과내부의친수성이영향을받았다. 결론 : 본연구를통해습윤제및착색염료가소프트렌즈표면및내부친수성에영향을미친다는것을밝혔으며, 이러한친수성에대한영향은착용감뿐만아니라소프트렌즈의여러재질특성에영향을미칠수있을것이라보인다. 주제어 : 소프트콘택트렌즈, 표면친수성, 내부친수성, 습윤제, 착색

DBPIA-NURIMEDIA

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