Contact Lens Fitting Today: Silicone Hydrogels Part 1: Technological .... Part 1 - Material properties. ... Invest Ophthalmol Vis Sci 2005;ARVO abstract #910. 47.
Contact Lens Fitting Today: Silicone Hydrogels Part 1: Technological developments By Lyndon Jones, PhD, FCOptom, DipCLP, DipOrth, FAAO (DipCL) and Kathy Dumbleton, MSc, MCOptom, FAAO References 1.
Morgan P, Efron N, et al.: International contact lens prescribing in 2004. Contact Lens Spectrum 2005; 20;1: 34 - 37.
2.
Ng C, Tighe B: Polymers in contact lens applications VI. The `dissolved' oxygen permeability of hydrogel and the design of materials for use in continuous wear lenses. Brit Polymer J 1976; 8 118-123.
3.
Morgan PB, Efron N: The oxygen performance of contemporary hydrogel contact lenses. Contact Lens and Anterior Eye 1998; 21;1: 3-6.
4.
Fatt I: Now do we need `effective permeability'? Contax 1986;July: 6-23.
5.
Jones L: Modern contact lens materials: A clinical performance update. Contact Lens Spectrum 2002; 17;9: 24 - 35.
6.
Holden B, Sweeney D, et al.: Epithelial erosions caused by thin high water content lenses. Clin Exp Optom 1986; 69;3: 103-107.
7.
Orsborn GN, Zantos SG: Corneal desiccation staining with thin high water content contact lenses. CLAO J 1988; 14;2: 81-85.
8.
Larke J, Parrish S, et al.: Apparent human corneal oxygen uptake rate. Am J Optom Physiol Opt 1981; 58;10: 803-805.
9.
Efron N: Intersubject variability in corneal swelling response to anoxia. Acta Ophthalmol (Copenh) 1986; 64;3: 302-305.
10.
Holden B, Sweeney D, et al.: The minimum precorneal oxygen tension to avoid corneal edema. Invest Ophthalmol Vis Sci 1984; 25 476-480.
11.
Papas E: On the relationship between soft contact lens oxygen transmissibility and induced limbal hyperaemia. Exp Eye Res 1998; 67;2: 125-131.
12.
Sweeney D, du Toit R, et al.: Clinical performance of silicone hydrogel lenses. in Silicone hydrogels: Continuous wear contact lenses, 2nd. D. Sweeney, Editor. Oxford, Butterworth-Heinemann, 2004, pp 164 - 216.
13.
Fonn D, Sweeney D, et al.: Corneal oxygen deficiency. Eye Contact Lens 2005; 31;1: 23-27.
14.
Brennan N, Fonn D: Corneal hypoxia. in Silicone Hydrogels: Continuous Wear Contact Lenses, 2nd. D. Sweeney, Editor. Oxford, Butterworth-Heinemann, 2004, pp 126 - 163.
15.
Harvitt DM, Bonanno JA: Re-evaluation of the oxygen diffusion model for predicting minimum contact lens Dk/t values needed to avoid corneal anoxia. Optom Vis Sci 1999; 76;10: 712 - 719.
16.
Brennan NA: Corneal oxygenation during contact lens wear: comparison of diffusion and EOP-based flux models. Clin Exp Optom 2005; 88;2: 103-108.
17.
Brennan NA: Beyond flux: total corneal oxygen consumption as an index of corneal oxygenation during contact lens wear. Optom Vis Sci 2005; 82;6: 467-472.
18.
Morgan P, Brennan N: The decay of Dk? Optician 2004; 227;5937: 27 - 33.
19.
Brennan NA: A model of oxygen flux through contact lenses. Cornea 2001; 20;1: 104-108.
20.
Refojo MF: Mechanism of gas transport through contact lenses. J Am Optom Assoc 1979; 50;3: 285-287.
21.
Tighe B: Rigid lens materials. in Contact Lens Practice, N. Efron, Editor. Oxford, Butterworth-Heinemann, 2002, pp 153 - 162.
22.
Tighe B: Silicone hydrogels: Structure, properties and behaviour. in Silicone Hydrogels: Continuous Wear Contact Lenses, D.
Sweeney, Editor. Oxford, Butterworth-Heinemann, 2004, pp 1 27. 23.
Gurland JE: Use of silicone lenses in infants and children. Ophthalmology 1979; 86;9: 1599-1604.
24.
Rae S, Huff J: Studies on initiation of silicone elastomer lens adhesion in vitro: binding before the indentation ring. CLAO J 1991; 17;3: 181-186.
25.
Huth S, Wagner H: Identification and removal of deposits on polydimethylsiloxane silicone elastomer lenses. Int Contact Lens Clin 1981; 8;7/8: 19-26.
26.
Nicolson PC, Vogt J: Soft contact lens polymers: an evolution. Biomaterials 2001; 22;24: 3273-3283.
27.
Bambury R, Seelye D: Vinyl carbonate and vinyl carbamate contact lens materials. Bausch & Lomb, 1997.
28.
Lopez-Alemany A, Compan V, et al.: Porous structure of Purevision versus Focus Night & Day and conventional hydrogel contact lenses. J Biomed Mater Res (Appl Biomat) 2002; 63 319 325.
29.
Kunzler J: Silicone-based hydrogels for contact lens applications. Contact Lens Spectrum 1999; 14;8 (supp): 9 - 11.
30.
Grobe G, Kunzler J, et al.: Silicone hydrogels for contact lens applications. Polymeric Materials Science and Engineering 1999; 80 108 - 109.
31.
Tighe B: Soft lens materials. in Contact Lens Practice, N. Efron, Editor. Oxford, Butterworth-Heinemann, 2002, pp 71 - 84. Snyder C: A primer on contact lens materials. Contact Lens Spectrum 2004; 19;2: 34 - 39.
32. 33.
Steffen R, Schnider C: A next generation silicone hydrogel lens for daily wear. Part 1 - Material properties. Optician 2004; 227;5954: 23 - 25.
34.
Steffen R, McCabe K: Finding the comfort zone. Contact Lens Spectrum 2004; 13;3: Supp 1 - 4.
35.
Dumbleton KA, Chalmers RL, et al.: Effect of lens base curve on subjective comfort and assessment of fit with silicone hydrogel continuous wear contact lenses. Optom Vis Sci 2002; 79;10: 633 637.
36.
Jones L, Dumbleton K: Silicone hydrogel lenses: Fitting procedures and in-practice protocols for continuous wear lenses. Optician 2002; 223;5840: 37 - 45.
37.
Nicolson PC: Continuous wear contact lens surface chemistry and wearability. Eye Contact Lens 2003; 29;1 Suppl: S30-32; discussion S57-39, S192-194.
38.
Nicolson P, Baron R, et al.: Extended wear ophthalmic lens. CIBA Vision; CSIRO, 1998.
39.
Weikart CM, Matsuzawa Y, et al.: Evaluation of plasma polymercoated contact lenses by electrochemical impedance spectroscopy. J Biomed Mater Res 2001; 54;4: 597-607.
40.
Valint PL, Jr., Grobe GL, 3rd, et al.: Plasma surface treatment of silicone hydrogel contact lenses. Bausch & Lomb, 2001.
41.
Karlgard C, Sarkar D, et al.: Drying methods for XPS analysis of PureVision, Focus Night&Day and conventional hydrogel contact lenses. Appl Surface Sci 2004; 230 106 - 114.
42.
Maldonado-Codina C, Morgan PB, et al.: Characterization of the surface of conventional hydrogel and silicone hydrogel contact lenses by time-of-flight secondary ion mass spectrometry. Optom Vis Sci 2004; 81;6: 455-460.
43.
Jones L, Long J, et al.: The impact of contact lens care regimens on the in vitro wettability of conventional and silicone-hydrogel contact lens materials. Invest Ophthalmol Vis Sci 2002; ARVO abstract # 3097.
44.
Cheng L, Muller SJ, et al.: Wettability of silicone-hydrogel contact lenses in the presence of tear-film components. Curr Eye Res 2004; 28;2: 93-108.
45.
Jones L, Senchyna M, et al.: Lysozyme and lipid deposition on silicone hydrogel contact lens materials. Eye Contact Lens 2003; 29;1 Suppl: S75-S79.
46.
Subbaraman L, Senchyna M, et al.: Kinetics of in vitro lysozyme deposition on silicone hydrogel, group II and group IV contact lens materials. Invest Ophthalmol Vis Sci 2005;ARVO abstract #910.
47.
Subbaraman LN, Glasier MA, et al.: Stabilization of lysozyme mass extracted from lotrafilcon silicone hydrogel contact lenses. Optom Vis Sci 2005; 82;3: 209-214.
48.
Senchyna M, Jones L, et al.: Quantitative and conformational characterization of lysozyme deposited on balafilcon and etafilcon contact lens materials. Curr Eye Res 2004; 28;1: 25-36.
49.
Court JL, Redman RP, et al.: A novel phosphorylcholine-coated contact lens for extended wear use. Biomaterials 2001; 22;24: 3261-3272.
50.
McNally J, McKenney CD: A clinical look at a silicone hydrogel extended wear lens. Contact Lens Spectrum 2002; 17;1: 38 - 41.
51.
McKenney C, Becker N, et al.: Lens deposits with a high Dk hydrophilic soft lens. Optom Vis Sci 1998; 75;12s: 276.
52.
Bruinsma GM, van der Mei HC, et al.: Bacterial adhesion to surface hydrophilic and hydrophobic contact lenses. Biomaterials 2001; 22;24: 3217-3224.
53.
Hart DE, Tidsale RR, et al.: Origin and composition of lipid deposits on soft contact lenses. Ophthalmology 1986; 93;4: 495503.
54.
Hart D, Lane B, et al.: Spoilage of hydrogel contact lenses by lipid deposits - tear-film potassium depression, fat, protein, and alcohol consumption. Ophthalmol 1987; 94;10: 1315-1321.
55.
Jones L, Evans K, et al.: Lipid and protein deposition of N-vinyl pyrrolidone-containing group II and group IV frequent replacement contact lenses. Clao J 1997; 23;2: 122-126.
56.
Franklin V, Bright A, et al.: Hydrogel polymers and occular spoilation processes. TRIP 1993; 1;1: 9-16.
57.
Tighe BJ, Jones L, et al.: Patient-dependent and materialdependent factors in contact lens deposition processes. Adv Exp Med Biol 1998; 438 745-751.
58.
Jones L, Mann A, et al.: An in vivo comparison of the kinetics of protein and lipid deposition on group II and group IV frequentreplacement contact lenses. Optom Vis Sci 2000; 77;10: 503-510.
59.
Young G: Toric contact lens designs in hyper-oxygen materials. Eye Contact Lens 2003; 29;1 Suppl: S171-173; discussion S190171, S192-174.
60.
Robinson R: Soft toric lenses: design matters. Contact Lens Spectrum 2005; 20;7: 52 - 54.
61.
Brennan NA, Coles C: Overnight corneal swelling with a silicone hydrogel (balafilcon A) toric lens. Optom Vis Sci 2004; 81;12s.
62.
Sczotka-Flynn L: Toric CLs: the next phase of silicone hydrogel materials. Contact Lens Spectrum 2005; 20;4: 23.
63.
Long B, Robirds S, et al.: Six months of in-practice experience with a high Dk Lotrafilcon A soft contact lens. Contact Lens & Ant Eye 2000; 23;4: 112 - 118.
64.
Montero Iruzubieta J, Nebot Ripoll JR, et al.: Practical experience with a high Dk lotrafilcon A fluorosilicone hydrogel extended wear contact lens in Spain. CLAO J 2001; 27;1: 41-46.
65.
Dumbleton KA, Chalmers RL, et al.: Vascular response to extended wear of hydrogel lenses with high and low oxygen permeability. Optom Vis Sci 2001; 78;3: 147 - 151.
66.
Nilsson SE: Seven-day extended wear and 30-day continuous wear of high oxygen transmissibility soft silicone hydrogel contact lenses: a randomized 1-year study of 504 patients. CLAO J 2001; 27;3: 125-136.
67.
Fonn D, MacDonald KE, et al.: The ocular response to extended wear of a high Dk silicone hydrogel contact lens. Clin Exp Optom 2002; 85;3: 176-182.
68.
Morgan PB, Efron N: Comparative clinical performance of two silicone hydrogel contact lenses for continuous wear. Clin Exp Optom 2002; 85;3: 183-192.
69.
Maldonado-Codina C, Morgan PB, et al.: Short-term physiologic response in neophyte subjects fitted with hydrogel and silicone hydrogel contact lenses. Optom Vis Sci 2004; 81;12: 911-921.
70.
McMonnies C: The critical initial comfort of soft contact lenses. Clin Exp Optom 1997; 80;2: 53-58.
71.
Efron N, Brennan NA, et al.: Determinants of the initial comfort of hydrogel contact lenses. Am J Optom Physiol Opt 1986; 63;10: 819-823.
72.
Dumbleton K, Keir N, et al.: Redness, dryness and comfort following refitting long term low Dk hydrogel wearers with silicone hydrogels. Optom Vis Sci 2004; 81;12s: 31.
73.
Doughty MJ, Fonn D, et al.: A patient questionnaire approach to estimating the prevalence of dry eye symptoms in patients presenting to optometric practices across Canada. Optom Vis Sci 1997; 74;8: 624-631.
74.
Orsborn G, Robboy M: Hydrogel lenses and dry-eye symptoms. J Brit Contact Lens Assoc 1989; Trans Ann Clin Conf 37-38.
75.
Begley CG, Chalmers RL, et al.: Characterization of ocular surface symptoms from optometric practices in North America. Cornea 2001; 20;6: 610-618.
76.
Fonn D, du Toit R, et al.: Sympathetic swelling response of the control eye to soft lenses in the other eye. Invest Ophthalmol Vis Sci 1999; 40;13: 3116 - 3121.
77.
Keay L, Jalbert I, et al.: Microcysts: clinical significance and differential diagnosis. Optometry 2001; 72;7: 452-460.
78.
Keay L, Sweeney DF, et al.: Microcyst response to high Dk/t silicone hydrogel contact lenses. Optom Vis Sci 2000; 77;11: 582 - 585.
79.
Dumbleton KA, Chalmers RL, et al.: Changes in myopic refractive error with nine months' extended wear of hydrogel lenses with high and low oxygen permeability. Optom Vis Sci 1999; 76;12: 845 849.
80.
Brennan NA, Coles ML, et al.: A 1-year prospective clinical trial of balafilcon a (PureVision) silicone-hydrogel contact lenses used on a 30-day continuous wear schedule. Ophthalmology 2002; 109;6: 1172-1177.
81.
Chalmers RL, Dillehay S, et al.: Impact of previous extended and daily wear schedules on signs and symptoms with high Dk lotrafilcon A lenses. Optom Vis Sci 2005; 82;6: 549-554.
82.
McMonnies C, Chapman-Davies A, et al.: The vascular response to contact lens wear. Am J Optom Physiol Opt 1982; 59 795 - 799. McMonnies C: Contact lens induced corneal vascularisation. Int Contact Lens Clin 1983; 10 12-21.
83. 84.
Jalbert I, Sweeney DF, et al.: Epithelial split associated with wear of a silicone hydrogel contact lens. CLAO J 2001; 27;4: 231-233.
85.
O'Hare N, Stapleton F, et al.: Interaction between the contact lens and the ocular surface in the etiology of superior epithelial arcuate lesions. Adv Exp Med Biol 2002; 506;Pt B: 973-980.
86.
Dumbleton K: Adverse events with silicone hydrogel continuous wear. Contact Lens & Ant Eye 2002; 25 137 - 146.
87.
Skotnitsky C, Sankaridurg PR, et al.: General and local contact lens induced papillary conjunctivitis (CLPC). Clin Exp Optom 2002; 85;3: 193-197.
88.
Skotnitsky C, Jalbert I, et al.: Case reports of three atypical infiltrative keratitis events with high DK soft contact lens wear. Cornea 2002; 21;3: 318-324.
89.
Dumbleton K, Jones L, et al.: Clinical characterization of spherical post-lens debris associated with lotrafilcon high-Dk silicone lenses. CLAO J 2000; 26;4: 186-192.
90.
Millar TJ, Papas EB, et al.: Clinical appearance and microscopic analysis of mucin balls associated with contact lens wear. Cornea 2003; 22;8: 740-745.
91.
Tan J, Keay L, et al.: Mucin balls with wear of conventional and silicone hydrogel contact lenses. Optom Vis Sci 2003; 80;4: 291297.
92.
Sczotka-Flynn L, Diaz-Insua M: Risk of infiltrates and CLPC with traditional hydrogel and silicone hydrogel extended wear: A meta analysis. Invest Ophthalmol Vis Sci 2005 ARVO abstract #2067.
93.
Wu P, Stapleton F, et al.: The causes of and cures for contact lensinduced peripheral ulcer. Eye Contact Lens 2003; 29;1 Suppl: S63-66; discussion S83-64, S192-194.
94.
Grant T, Chong MS, et al.: Contact lens induced peripheral ulcers during hydrogel contact lens wear. CLAO J 1998; 24;3: 145-151.
95. Willcox M, Sankaridurg P, et al.: Inflammation and infection and the effects of the closed eye. in Silicone hydrogels: Continuous wear contact lenses, 2nd. D. Sweeney, Editor. Oxford, ButterworthHeinemann, 2004, pp 90 - 125. 96.
Holden BA, La Hood D, et al.: Gram-negative bacteria can induce contact lens related acute red eye (CLARE) responses. CLAO J 1996; 22;1: 47-52.
97.
Willcox MD, Hume EB: Differences in the pathogenesis of bacteria isolated from contact-lens- induced infiltrative conditions. Aust N Z J Ophthalmol 1999; 27;3-4: 231-233.
98.
Sankaridurg PR, Willcox MD, et al.: Haemophilus influenzae adherent to contact lenses associated with production of acute ocular inflammation. J Clin Microbiol 1996; 34;10: 2426-2431.
99.
Sankaridurg PR, Vuppala N, et al.: Gram negative bacteria and contact lens induced acute red eye. Indian J Ophthalmol 1996; 44;1: 29-32.
100. Ren DH, Petroll WM, et al.: The relationship between contact lens oxygen permeability and binding of Pseudomonas aeruginosa to human corneal epithelial cells after overnight and extended wear. CLAO J 1999; 25;2: 80-100. 101. Cavanagh HD, Ladage P, et al.: Effects of daily and overnight wear of hyper-oxygen transmissible rigid and silicone hydrogel lenses on bacterial binding to the corneal epithelium: 13-month clinical trials. Eye Contact Lens 2003; 29;1 Suppl: S14-16; discussion S26-29, S192-194. 102. Cavanagh HD, Ladage PM, et al.: Effects of daily and overnight wear of a novel hyper oxygen-transmissible soft contact lens on bacterial binding and corneal epithelium: a 13-month clinical trial. Ophthalmology 2002; 109;11: 1957-1969. 103. Ren DH, Yamamoto K, et al.: Adaptive effects of 30-night wear of hyper-O2 transmissible contact lenses on bacterial binding and corneal epithelium: A 1-year clinical trial. Ophthalmology 2002; 109;1: 27-39. 104. Syam P, Hussain B, et al.: Mixed infection (Pseudomonas and coagulase negative staphylococci) microbial keratitis associated with extended wear silicone hydrogel contact lens. Br J Ophthalmol 2004; 88;4: 579. 105. Whiting MA, Raynor MK, et al.: Continuous wear silicone hydrogel contact lenses and microbial keratitis. Eye 2004. 106. Holden BA, Sweeney DF, et al.: Microbial keratitis and vision loss with contact lenses. Eye Contact Lens 2003; 29;1 Suppl: S131134; discussion S143-134, S192-134. 107. Lee KY, Lim L: Pseudomonas keratitis associated with continuous wear silicone-hydrogel soft contact lens: a case report. Eye Contact Lens 2003; 29;4: 255-257. 108. Lim L, Loughnan MS, et al.: Microbial keratitis associated with extended wear of silicone hydrogel contact lenses. Br J Ophthalmol 2002; 86;3: 355-357.
109. Morgan PB, Efron N, et al.: Incidence of keratitis of varying severity among contact lens wearers. Br J Ophthalmol 2005; 89;4: 430-436. 110. Stapleton F, Edwards K, et al.: The incidence of contact lens related microbial keratitis in Australia. Invest Ophthalmol Vis Sci 2005 ARVO abstract #5025. 111. Baveja JK, Willcox MD, et al.: Furanones as potential antibacterial coatings on biomaterials. Biomaterials 2004; 25;20: 5003-5012.
