The effect of lens wear on refractive index of conventional hydrogel and silicone-hydrogel contact lenses: A comparative study

Contact Lens and Anterior Eye

Volumn 31, Issue 2, 2008, Pages 89-94

  Lira, M ^a   Santos, L ^a   Azeredo, J ^a   Yebra Pimentel, E ^b   Real Oliveira, M E C D ^a  

^a UNIVERSITY OF MINHO   (Portugal)

^b UNIVERSITY OF SANTIAGO DE COMPOSTELA   (Spain)

Author keywords

Automated refractometer CLR 12 70; Conventional hydrogel contact lens; Equilibrium water content; Refractive index; Silicone hydrogel contact lenses

Indexed keywords

1 VINYL 2 PYRROLIDINONE; CARBAMIC ACID DERIVATIVE; DIMETICONE; ETHYLENE GLYCOL DIMETHACRYLATE; METHACRYLIC ACID; N,N DIMETHYLACRYLAMIDE; POLYMACON; SILICONE;

ADOLESCENT; ADULT; ARTICLE; AUTOMATION; BIOCOMPATIBILITY; CLINICAL EFFECTIVENESS; COMPARATIVE STUDY; CONTROLLED STUDY; DISPOSABLE EQUIPMENT; HUMAN; HYDROGEL; HYDROPHILIC CONTACT LENS; MAJOR CLINICAL STUDY; PRIORITY JOURNAL; REFRACTION INDEX; REFRACTOMETER; STATISTICAL SIGNIFICANCE; TREATMENT OUTCOME; WATER CONTENT;

CONTACT LENSES; EQUIPMENT DESIGN; EQUIPMENT FAILURE ANALYSIS; FEMALE; HUMANS; HYDROGELS; MALE; REFRACTION, OCULAR; REFRACTIVE ERRORS; REPRODUCIBILITY OF RESULTS; SENSITIVITY AND SPECIFICITY; SILICON; TREATMENT OUTCOME;

EID: 41949111145     PISSN: 13670484     EISSN: 14765411     Source Type: Journal    
DOI: 10.1016/j.clae.2007.09.001     Document Type: Article

References (46)

1. Nicolson P.C., and Vogt J. Soft contact lens polymers: an evolution. Biomaterials 22 (2001) 3273-3283
2. Tighe B. In: Sweeney D. (Ed). Silicone hydrogels: the rebirth of continuous wear (2000), Butterworth-Heinemann, Oxford 1-21
3. Nichols J.J., and Berntsen D.A. The assessment of automated measures of hydrogel contact lens refractive index. Ophthal Physiol Opt 23 (2003) 517-525
4. Andrasko G., and Schoessler J.P. The effect of humidity on dehydration of soft contact lens on the eye. ICLC 7 (1980) 210-213
5. Lowther G.E. Lens dehydration: what are the problems and the management?. ICLC 10 (1983) 7
6. Paugh J.R. Equivalent oxygen percentage as a function of hydration in hydrogel lenses: an in vivo study. Optom Vis Sci 69 (1992) 805-810
7. Brennan N.A., Efron N., Bruce A.S., Duldig D.I., and Russo N.J. Dehydration of hydrogel lenses: environmental influences during normal wear. Am J Optom Physiol Opt 65 (1988) 277-281
8. Morgan P.B., Efron N., Morgan S.L., and Little S.A. Hydrogel contact lens dehydration in controlled environmental conditions. Eye Cont Lens 30 (2004) 99-102
9. Cabrera J.V., and Velasco M.J. Recovery of the water content of hydrogel contact lenses after use. Ophthal Physiol Opt 25 (2005) 452-457
10. Pritchard N., Fonn D., and Brazeau D. Discontinuation of contact lens wear: a survey. Int Cont Lens Clin 26 (1999) 157-162
11. Young G., Veys J., Pritchard N., and Coleman S. A multi-centre study of lapsed contact lens wearers. Ophthal Physiol Opt 22 (2002) 516-527
12. Efron N., Brennan N.A., Bruce A.S., Duldig D.I., and Russo N.J. Dehydration of hydrogel lenses under normal wearing conditions. CLAO J 13 (1987) 152-156
13. Pritchard N., and Fonn D. Dehydration, lens movement and dryness ratings of hydrogel contact lenses. Ophthal Physiol Opt 15 (1995) 281-286
14. Nichols J.J., and Sinnott L.T. Tear film, contact lens, and patient-related factors associated with contact lens-related dry eye. Invest Ophthal Vis Sci 47 (2006) 1319-1328
15. Andrasko G. Hydrogel dehydration in various environments. ICLC 10 (1983) 23-28
16. Nason R.J., Boshnick E.L., and Cannon W.M. Multisite comparison of contact lens modalities. Daily disposable wear vs. conventional daily wear in successful contact lens wearers. J Am Optom Assoc 65 (1994) 774-780
17. Boswall G.J., Ehlers W.H., Luistro A., Worrall M., and Donshik P.C. A comparison of conventional and disposable extended wear contact lenses. CLAO J 19 (1993) 158-165
18. Cheng L., Muller S.J., and Radke C.J. Wettability of silicone-hydrogel contact lenses in the presence of tear-film components. Curr Eye Res 28 (2004) 93-108
19. Jones L., Franklin V., Evans K., Sariri R., and Tighe B. Spoilation and clinical performance of monthly vs. three monthly Group II disposable contact lenses. Optom Vis Sci 73 (1996) 16-21
20. Fonn D., Pritchard N., and Dumbleton K. In: Sweeney D. (Ed). Silicone hydrogels: the rebirth of continuous wear contact lenses (2000), Butterwrth-Heinemann, Oxford, UK 214-234
21. Tighe B. Silicone hydrogels: what are they and how should they be used in everyday practice?. Optician (1999) 31-32
22. Jones L., Senchyna M., Glasier M.A., Schickler J., Forbes I., Louie D., et al. Lysozyme and lipid deposition on silicone hydrogel contact lens materials. Eye Con Lens 29 (2003) S75-S79
23. Moradi O., Modarress H., and Noroozi M. Experimental study of albumin and lysozyme adsorption onto acrylic acid (AA) and 2-hydroxyethyl methacrylate (HEMA) surfaces. J Colloid Interface Sci 271 (2004) 16-19
24. Bruinsma G.M., van der Mei H.C., and Busscher H.J. Bacterial adhesion to surface hydrophilic and hydrophobic contact lenses. Biomaterials 22 (2001) 3217-3224
25. Henriques M., Sousa C., Lira M., Real Oliveira M.E.C.D., Oliveira R., and Azeredo J. Adhesion of Pseudomonas aeruginosa and Staphylococcus epidermidis to silicone-hydrogel contact lenses. Optom Vis Sci 82 (2005) 446-450
26. Lopez-Alemany A., Compan V., and Refojo M.F. Porous structure of Purevision versus Focus Night&Day and conventional hydrogel contact lenses. J Biomed Mater Res 63 (2002) 319-325
27. Brennan N.A. A simple instrument for measuring the water content of hydrogel lenses. ICLC (1983) 357-361
28. Mousa G.Y., Calander M.G., Sivak J.G., and Egan D.J. The effect of the hydration characteristics of hydrogel lenses on the refractive index. ICLC (1983) 31-37
29. Gonzalez-Meijome J.M., Lira M., Lopez-Alemany A., Almeida J.B., Parafita M.A., and Refojo M.F. Refractive index and equilibrium water content of conventional and silicone hydrogel contact lenses. Ophthal Physiol Opt 26 (2006) 57-64
30. Gonzalez-Meijome J.M., Lopez-Alemany A., Lira M., Almeida J.B., Real Oliveira M.E.C.D., and Parafita M.A. Equivalences between refractive index and equilibrium water content of conventional and silicone hydrogel soft contact lenses from automated and manual refractometry. J Biomed Mater Res B Appl Biomater 80 (2007) 184-191
31. Brennan N.A., Efron N., Truong V.T., and Watkins R.D. Definitions for hydration changes of hydrogel lenses. Ophthal Physiol Opt 6 (1986) 333-338
32. Alemany A.L., and Refojo M.F. Comparative study of the hydration of hydrophilic contact lenses by refractive index and gravimetry. CLAO J 26 (2000) 200-203
33. Morgan P.B., and Efron N. In vivo dehydration of silicone hydrogel contact lenses. Eye Cont Lens 29 (2003) 173-176
34. Nichols J.J., Mitchell G.L., and Good G.W. The reliability and validity of hand-held refractometry water content measures of hydrogel lenses. Optom Vis Sci 80 (2003) 447-453
35. Brennan N.A., Lowe R., Efron N., and Harris M.G. In vivo dehydration of disposable (Acuvue) contact lenses. Optom Vis Sci 67 (1990) 201-203
36. Fonn D., Situ P., and Simpson T. Hydrogel lens dehydration and subjective comfort and dryness ratings in symptomatic and asymptomatic contact lens wearers. Optom Vis Sci 76 (1999) 700-704
37. Kohler J.E., and Flanagan G.W. Clinical dehydration of extended wear lenses. Int Cont Lens Clin (1985) 152-161
38. Tranoudis I., and Efron N. Water properties of soft contact lens materials. Cont Lens Anterior Eye 27 (2004) 193-208
39. Efron N., and Morgan P.B. Hydrogel contact lens dehydration and oxygen transmissibility. CLAO J 25 (1999) 148-151
40. Fornasiero F., Prausnitz J.M., and Radke C.J. Post-lens tear film depletion due to evaporative dehydration of a soft lens. J Membr Sci (2006) 229-243
41. Jones L., May C., Nazar L., and Simpson T. In vitro evaluation of the dehydration characteristics of silicone hydrogel and conventional hydrogel contact lens materials. Cont Lens Anterior Eye 25 (2002) 147-156
42. Hall B., Jones S., Young G., and Coleman S. The on-eye dehydration of proclear compatibles lenses. CLAO J 25 (1999) 233-237
43. Tranoudis I., and Efron N. Parameter stability of soft contact lenses made from different materials. Cont Lens Anterior Eye 27 (2004) 115-131
44. Lebow K., and Bridgewater B. A three-month comparative daily-wear study of two high water content soft lenses. ICLC (1997) 198-205
45. Morgan P.B., and Efron N. Hydrogel contact lens ageing. CLAO J 26 (2000) 85-90
46. Santos L., Rodrigues D., Lira M., Real Oliveira M.E.C.D., Oliveira R., and Azeredo J. The influence of surface treatment on hydrophobicity, protein adsorption and microbial colonisation of silicone hydrogel contact lenses. Cont Lens Anterior Eye 30 (2007) 183-188