Contact Lens Spectrum


November 2011

Document #192



(p. 16) Research Review: Silicone Hydrogels: Is There a Comfort Advantage?

By Eric Papas, OD, PhD, MCOptom, DipCL, FAAO

1. Brennan NA, Coles MLC, Comstock TL, Levy B. A 1-year prospective clinical trial of balafilcon A (PureVision) silicone-hydrogel contact lenses used on a 30-day continuous wear schedule. Ophthalmology. 2002;109:1172-1177.

2. Chalmers RL, Hunt C, Hickson-Curran S, Young G. Struggle with hydrogel CL wear increases with age in young adults. Cont Lens Anterior Eye. 2009;32:113-119.

3. Cheung SW, Cho P, Chan B, Choy C, Ng V. A comparative study of biweekly disposable contact lenses: Silicone hydrogel versus hydrogel. Clin Exp Optom. 2007;90:124-131.

4. Dillehay SM, Miller MB. Performance of lotrafilcon B silicone hydrogel contact lenses in experienced low-Dk/t daily lens wearers. Eye Contact Lens. 2007;33:272-277.

5. Dumbleton K, Keir N, Moezzi A, Feng Y, Jones L, Fonn D. Objective and subjective responses in patients refitted to daily-wear silicone hydrogel contact lenses. Optom Vis Sci. 2006;83:758-768.

6. Guillon M, Maissa C. Use of silicone hydrogel material for daily wear. Cont Lens Anterior Eye. 2007;30:5-10.

7. Riley C, Young G, Chalmers R. Prevalence of ocular surface symptoms, signs, and uncomfortable hours of wear in contact lens wearers: The effect of refitting with daily-wear silicone hydrogel lenses (senofilcon A). Eye Contact Lens. 2006; 32:281-286.

8. Santodomingo-Rubido J, Barrado-Navascues E, Rubido-Crespo M. Ocular surface comfort during the day assessed by instant reporting in different types of contact and non-contact lens wearers. Eye and Contact Lens. 2010;36:96-100.

9. Schafer J, Mitchell GL, Chalmers RL, Long B, Dillehay S, Barr J, Bergenske P, Donshik P, Secor G, Yoakum J. The stability of dryness symptoms after refitting with silicone hydrogel contact lenses over 3 years. Eye Contact Lens. 2007;33:247-252.

10. Young G, Riley CM, Chalmers RL, Hunt C. Hydrogel lens comfort in challenging environments and the effect of refitting with silicone hydrogel lenses. Optom Vis Sci. 2007;84:302-308.



(p. 20) GP Insights: Is Apical Bearing Acceptable When Fitting Keratoconus?

By Gregory W. DeNaeyer, OD, FAAO

1. Korb DR, Finnemore VM, Herman JP. Apical changes and scarring in keratoconus as related to contact lens fitting techniques. J Am Optom Assoc. 1982;53:199-205.

2. Zadnik K, Barr JT, Steger-May K, et al. Comparison of Flat and Steep Rigid Contact Lens Fitting Methods in Keratoconus. Optom Vis Sci. 2005;82:1014-1021.

3. Soraba L, Chong T, Fonn D. Visual acuity, lens flexure, and residual astigmatism of keratoconic eyes as a function of back optic zone radius of rigid lenses. Cont Lens Anterior Eye. 2000;23:48-52.

4. Jinabhai A, Radhakrishnan H, O’Donnell C. Visual Acuity and Ocular Aberrations With Different Rigid Gas Permeable Lens Fitting in Keratoconus. Eye Contact Lens. 2010;36:233-237.

5. Barr JT, Wilson BS, Gordon MO, et al. Estimation of the Incidence and Factors Predictive of Corneal Scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Cornea 2006;25:16-25.

6. Kenney C, Brown DJ. The cascade hypothesis of keratoconus. Cont Lens Anterior Eye. 2003;26:139-146.

7. Kamiya K, Shimizu K, Ohmoto F. Effect of aging on corneal biomechanical parameters using the ocular response analyzer. J Refract Surg. 2009;25:888-893.

8. Elsheikh A, Wang D, Brown M, et al. Assessment of corneal biomechanical properties and their variation with age. Curr Eye Res. 2007;32:11-19.



(p. 24) Improving Vision Outcomes for Presbyopic Patients

By Bill Reindel, OD, MS; Gerard Cairns, PhD, MCOptom, FAAO; & Paul China, OD, FAAO

1. Needs, Symptoms, Incidence, Global eye Health Trends (NSIGHT) Study. Market Probe Europe. December 2009.

2. Bennett ES. Contact lens correction of presbyopia. Clin Exp Optom. 2008;91:265-278.

3. Morgan PB, Efron N. Contact lens correction of presbyopia. Cont Lens Anterior Eye. 2009;32:191-192.

4. Situ P, Du Toit R, Fonn D, Simpson T. Successful monovision contact lens wearers refitted with bifocal contact lenses. Eye Contact Lens. 2003;29:181-184.



(p. 48) Treatment Plan: Supplements and Glaucoma

By Leo Semes, OD, FAAO

1. West AL, Oren GA, Moroi SE. Evidence for the use of nutritional supplements and herbal medicines in common eye diseases. Am J Ophthalmol. 2006;141:157-66.

2. Sangiovanni JP, Agrón E, Meleth AD, et al; Age-Related Eye Disease Study Research Group. {omega}-3 Long-chain polyunsaturated fatty acid intake and 12-y incidence of neovascular age-related macular degeneration and central geographic atrophy: AREDS report 30, a prospective cohort study from the Age-Related Eye Disease Study. Am J Clin Nutr. 2009;90:1601-1607.

3. Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8. Arch Ophthalmol. 2001;119:1417-1436. Erratum in: Arch Ophthalmol. 2008;126:1251.

4. Klein BEK, Knudson MD, Lee KE, et al. Supplements and Age-Related Eye Conditions. The Beaver Dam Eye Study. Ophthalmology. 2008;115:1203–1208.

5. McElnea EM, Quill B, Docherty NG, et al. Oxidative stress, mitochondrial dysfunction and calcium overload in human lamina cribrosa cells from glaucoma donors. Mol Vis. 2011;17:1182-1191.

6. Steigerwalt RD Jr, Belcaro G,  Morazzoni P, Bombardelli E, Burki C, Schönlau F. Mirtogenol potentiates latanoprost in lowering intraocular pressure and improves ocular blood flow in asymptomatic subjects. Clin Ophthalmol. 2010;4:471–476.

7. Rhee DJ, Spaeth GL, Myers JS, et al. Prevalence of the use of complementary and alternative medicine for glaucoma. Ophthalmology. 2002;109:438-443.

8. Wan MJ, Daniel S, Kassam F, et al. Survey of Complementary and Alternative Medicine Use in Glaucoma Patients. J Glaucoma. 2010;Dec 16. [Epub ahead of print, PMID: 21173701 DOI: 10.1097/IJG.0b013e3182027c0c]



(p. 50) Reader and Industry Forum: Effective Optics of Piggyback Soft Contact Lenses

By Minhee Woo, OD, and Barry A. Weismann, OD, PhD

1. Baldone JA, Clark WB. Contact lens in the aphakic child. Contact Lens Med Bull. 1970;3:25-27.

2. Westerhout D. The combination lens and therapeutic uses of soft lenses. Contact Lens. 1973;4:3-9.

3. Weissman BA, Ye P. Calculated tear oxygen tension under contact lenses offering resistance in series: piggyback and scleral lenses. Cont Lens Anterior Eye. 2006;29:231-237.

4. Larson B, Edrington T. Piggybacking with soft torics. CL Spectrum. 2010;6.

5. Brazeau D. Fitting and Effective Power of Soft Lenses in Piggyback System. Global Specialty Lens Symposium presentation, 2009.

6. Benjamin WJ: Chpts 26 Applied Optics of Contact Lens Correction & 27 Clinical Optics of Contact Lens Correction, in Benjamin WJ (ed): Borish’s Clinical Refraction 2/e, Butterworth, Heinemann, Elsevier; St Louis; 2006.

7. Schendowich B. Summing Up Piggybacking of Contact Lenses CL Spectrum. 2008;3.

8. Nixon GJ. A Report from GSLS 2010. CL Spectrum. 2010;5.

9. Weissman BA. A general relationship between changing surface radii of flexing soft contact lenses. Am J Optom Physiol Opt. 1984a;60:651-653.

10. Weissman BA. Clinical soft lens power changes. Int Cont Lens Clin ll. 1984b;6:342-346.

11. Plainis S, Charman WN. On-eye power characteristics of soft contact lenses. Optom Vis Sci. 1998;75:44-54.



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