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Peer-reviewed articles

2016

Jones,D., Woods,C., Jones,L., Efron,N., Morgan,P. A sixteen year survey of Canadian contact lens prescribing. Contact Lens and Anterior Eye 2016;39,6:402-410. [ Show Abstract ]

Purpose To understand long-term contact lens prescribing habits of Canadian optometrists. Methods One thousand optometrists were surveyed annually from 2000 to 2015. Information was requested on the first ten patients examined after receiving the survey. Results Over the 16-year survey period, 1987 optometrists provided information on 19,143 patients. Mean age of the patients was 32.7 ± 14.4 years. Ratio of females to males was 2:1, the ratio of new fits to refits was 2:3. Soft contact lenses represented 94.5% of all fits. Rigid lenses were more often used as a refit compared to a new fit. Over the 16 years, market share for silicone hydrogel materials grew from 0% to 69.6%, mid-water content materials declined from 75.7% to 14.1%. The multifocal market share grew at the expense of spherical designs, with no change in toric lens fitting. Monthly soft lens replacement remained the preferred option at 48.2%, followed by daily disposable at 40.8%; two-weekly replacement declined to less than10% of patients by 2015. Extended wear was likely used to refit and only to a small proportion of wearers, representing 2.6% of SCL by 2015. The lens care system of choice throughout the period was multipurpose solutions, although the proportion for peroxide systems more than doubled by 2015 from 9.6%, to 21.1%. Conclusions Over the 16-year period, SCL material preference changed to silicone hydrogels with monthly replacement being preferred; daily disposables replacing 2-weekly as the alternate. Lens care preference continued to be multipurpose solutions. Rigid lenses appear to be sustained for specialist fitting. © 2016 British Contact Lens Association

2011

Efron,N., Morgan,P. B., Helland,M., Itoi,M., Jones,D., Nichols,J. J., van der Worp,E., Woods,C. A. Soft toric contact lens prescribing in different countries. Contact Lens and Anterior Eye 2011;34,1:36-38.

Morgan,P. B., Efron,N., Helland,M., Itoi,M., Jones,D., Nichols,J. J., van der Worp,E., Woods,C. A. Global trends in prescribing contact lenses for extended wear. Contact Lens and Anterior Eye 2011;34,1:32-35.

2010

Efron,N., Morgan,P. B., Helland,M., Itoi,M., Jones,D., Nichols,J. J., van der Worp,E., Woods,C. A. Daily disposable contact lens prescribing around the world. Contact Lens and Anterior Eye 2010;33,5:225-227.

Efron,N., Morgan,P. B., Helland,M., Itoi,M., Jones,D., Nichols,J. J., van der Worp,E., Woods,C. A. International rigid contact lens prescribing. Contact Lens and Anterior Eye 2010;33,3:141-143.

Morgan,P. B., Efron,N., Helland,M., Itoi,M., Jones,D., Nichols,J. J., van der Worp,E., Woods,C. A. Twenty first century trends in silicone hydrogel contact lens fitting: An international perspective. Contact Lens and Anterior Eye 2010;33,4:196-198.

Morgan,P. B., Efron,N., Helland,M., Itoi,M., Jones,D., Nichols,J. J., van der Worp,E., Woods,C. A. Demographics of international contact lens prescribing. Contact Lens and Anterior Eye 2010;33,1:27-29.

2007

Woods,C. A., Jones,D. A., Jones,L. W., Morgan,P. B. A seven year survey of the contact lens prescribing habits of Canadian optometrists. Optometry and Vision Science 2007;84,6:505-510. [ Show Abstract ]

PURPOSE: Little is known about the contact lens prescribing habits of optometrists in North America. The purpose of this survey was to obtain data on the types of lenses and solutions prescribed by Canadian optometrists. METHODS: One thousand Canadian optometrists were surveyed annually over seven consecutive years (2000 to 2006; n = 7000) on their contact lens prescribing preferences. Each survey requested a range of information about the contact lenses prescribed to the first 10 patients after its receipt. RESULTS: Over this time period, 1008 (14.4%) of the surveys were returned, providing data on 9383 fits. During the seven-year period, the ratio of male:female fits was 1:2 (3123:6217, 43 not reported), with a mean age of 31.3 +/- 13.6 years (range 2 to 82 years). The ratio of new fits to refits was 2:3 (3780:5518, 85 not reported), with 91.3% of all fits being soft contact lenses (SCL). Of the SCL fits, 59.5% were spherical, 28.5% toric, 9.7% multifocal, and 2.3% cosmetic tints. Gas permeable (GP) fits were 46.6% spherical, 18.6% toric, 19.5% multifocal, and 6.6% were for orthokeratology (OK). Over the seven-year period, SCL prescribed for continuous wear (CW) increased from 3.2% to 14.3% between 2000 and 2004 and reduced to 8.1% in 2006, for all fits. The use of mid-water content (MWC) materials decreased from 34.6% to 2.7% and the use of silicone hydrogel (SH) lenses increased from 61.4% to 96.2%, for all CW fits. GP lens continuous wear increased from 0.7% to 30.6% of all GP lens fits by 2006. Daily wear (DW) of SH lenses decreased from 49.6% (2000) to 33.7% (2004) and then increased to 86.1% in 2006, for SH fits. MWC SCL fit on a monthly planned replacement (PR) basis reduced in popularity over the seven-year period (75.0% to 39.9%) and in 2006 more patients were fit overall with SH lenses (42.9%). The use of non-PR SCL declined from 20.5% to 4.5% of all fits. Fitting of low-water content lenses also declined (15.1% to 7.0%). High-water content (5.4% to10.2%) and SH lenses (5.4% to 42.9%) both increased. By 2006, the majority of GP lenses fit were with high Dk (HDK) materials (50.3%). CONCLUSIONS: The preferred contact lens modality for Canadian optometrists appears to be DW SCL, which are replaced monthly. The proportion of lenses used for CW peaked in 2004, with SH SCL being the preferred material. The market share for GP lenses remains relatively unchanged, with an increasing proportion used for OK and CW. The launch of DW SH lenses in 2004 resulted in a marked increase in their reported fits, with a similar effect following the launch of a HDK GP lens material for CW.

Schulze,M. M., Jones,D. A., Simpson,T. L. The development of validated bulbar redness grading scales. Optometry and Vision Science 2007;84,10:976-983. [ Show Abstract ]

PURPOSE: To develop a perceptually and physically based bulbar redness grading scale. METHODS: Digital conjunctival hyperemia photographs were taken using a photo-slit lamp at controlled exposures. Nine participants arranged 25 images on a tabletop over a range of 1.5 m, using separation to represent changes in redness. The position of each image was recorded and normalized for a 0 to 100 scale, and compared to chromaticity of each image obtained using a spectrophotometer. The performance of two versions of the scale (5 and 10 images) and a continuous grading scale was evaluated based on repeatability data collected from nineteen observers who used each scale twice to grade 30 randomly presented images of bulbar redness. RESULTS: Psychophysical scaling was highly correlated between single observers (Pearson's r >or= 0.92, p < 0.05). The averaged subjective grades significantly correlated with chromaticity (r = 0.95 and r = 0.99, p < 0.001 for CIE u* and log u*, respectively). Across all observers, test and retest ratings were highly correlated with either scale (r >or= 0.98), and showed high levels of repeatability expressed by intraclass correlation coefficients (ICC >or= 0.98), correlation coefficients of concordance (CCC >or= 0.96), and coefficients of repeatability (COR <or= 5.64). Despite single unit increment options, the majority of grade values assigned using the discrete scales were distributed in multiples of 5. CONCLUSIONS: Combining psychophysical and physical attributes is a promising method for the development of novel anterior segment scales; the newly developed scales performed well in a clinical setting.

2003

Hrynchak,P., Hutchings,N., Jones,D., Simpson,T. A comparison of cup-to-disc ratio evaluation in normal subjects using stereo biomicroscopy and digital imaging of the optic nerve head. Ophthalmic and Physiological Optics 2003;23,1:51-59. [ Show Abstract ]

The cup-to-disc (CD) ratio evaluated using stereoscopic biomicroscopy was compared with that evaluated by viewing a non-stereo digital image of the optic nerve head. Twenty normal subjects (mean age 26 +/- 4 years) were evaluated by two observers. The average CD ratio was 0.29 with a range of 0-0.80. The intra-class correlations between the observers ranged from 0.82 to 0.96, when comparing horizontal and vertical CD ratios for both evaluation techniques. The mean CD ratio was significantly smaller when viewing the digital image (0.25 +/- 0.01) compared with stereoscopic observation (0.33 +/- 0.03, p < 0.0001). Although the mean differences between the two techniques were small, the percentage of CD ratios that differed by >or=0.2 were between 5 and 25% of evaluations. Caution should be exercised when using stereoscopic and non-stereo digital evaluations of CD ratio interchangeably to assess longitudinal progression in a multi-clinician setting.

2001

Jones,L. W., Jones,D. A. Non-inflammatory corneal complications of contact lens wear. Contact Lens and Anterior Eye 2001;24,2:73-79. [ Show Abstract ]

Contact lenses can induce changes in the epithelium, stroma and endothelium of the cornea, all of which can be observed clinically using the slit-lamp biomicroscope. These complications include epithelial microcysts, vacuoles and staining, stromal oedema and vascularization, and endothelial polymegethism and blebs. Each complication can be attributed to one or more aetiological factors such as hypoxia, hypercapnia, tissue acidosis, trauma, hypersensitivity and toxicity. This review outlines the way in which these complications manifest clinically, and consideration is given to management strategies and likely prognoses. Early detection of these conditions and appropriate action can usually prevent more serious ocular complications.

Abstracts

2016

Back A, Chamberlain P, Logan N, Jones D, Gonzalez-Meijome J, Mei Saw S, Young G. Clinical evaluation of a dual-focus myopia control 1 day soft contact lens - 2-year results. Optom Vis Sci 2016;93: E-abstract 160035.

Yang M, Luensmann D, Fonn D, Woods J, Gordon K, Jones L, Jones D. Myopia prevalence in canadian school children. Optom Vis Sci 2016;93: E-abstract 165328. [ PDF ]

2012

Jones D, Woods C, Paquette L, Nandakumar K. The acceptability of contact lens wear to children and teenagers. Contact Lens & Anterior Eye 2012;35,S1:e45-e46.

Jones D, Paquette L, Despres M, Nandakumar K, Woods C. Ease of contact lens fitting and training in a child and youth population. Contact Lens & Anterior Eye 2012;35,S1:e2.

2011

Paquette L, Jones D, Mespres M, Nandakumar K, Woods C. Ease of contact lens fitting and training in a child and youth population. Optom Vis Sci 2011;88:E-abstract 115833.

2008

Jones D, Jones L. The use of O2Optix Custom in a case of pediatric aphakia. Contact Lens & Anterior Eye 2008;31,5:246.

2007

Jones D, Jones L. The use of 02Optix Custom in a case of pediatric aphakia. Optom Vis Sci 2007;84: E-abstract 075149.

2006

Jones D, Woods C, Jones L, Morgan P. The use of silicone hydrogel contact lenses by Canadian optometrists: 2000-2006. Optom Vis Sci 2006;83: E-Abstract 065281.

2005

Woods C, Jones D, Jones L, Morgan P. Canadian optometrists prescribing habits, a six-year period (2000-05). Optom Vis Sci 2005;82: E-abstract 055128.

2002

Hrynchak P, Hutchings N, Jones D, Simpson T. A comparison of cup-to-disc ratio measurement in normal subjects using OCT image analysis of the optic nerve head and stereo biomicroscopy. Optom Vis Sci 2002;79,12s:90.

2001

Jones D, Schulze M, Simpson T. The Application of Clinical Grading Scales by Trained and Non-trained Observers. Contact Lens & Anterior Eye 2001;2523-51.

Schulze M, Jones D, Simpson T. The Production of an Enhanced Grading Scale for Determination of Ocular Hyperaemia (BCLA 2001 Da Vinci Award). Contact Lens & Anterior Eye 2001;2523-51.

Hrynchak P, Simpson T, Jones D, Hutchings N. A comparison of cup-to-disc ratio evaluation in normal subjects using stereo biomicroscopy and a digital image of the optic nerve. Optom Vis Sci 2001;78,12s:65.

2000

Schulze M, Jones D, Simpson T. The production of an enhanced grading scale for determination of ocular hyperemia. Optom Vis Sci 2000;77,12s:184.

Jones D, Jones L, Dumbleton K, Pritchard N. Recording of contact lens complications using digital image technology. Contact Lens & Anterior Eye 2000;23,4:160.

1999

Jones L, Jones D, Simpson T. The impact of replacement frequency and care regimen on subjective satisfaction with disposable/frequent replacement lenses. Optom Vis Sci 1999;76,12s:172.

Jones D, Jones L, Simpson T. The subjective satisfaction of presbyopes wearing disposable/frequent replacement lenses: a comparison of monovision versus reading over-spectacles. Optom Vis Sci 1999;76,12s:174.

Jones L, Jones D, Franklin V, Tonge S, Tighe B. Multi-purpose solution effects on the clinical performance and spoilation of daily wear monthly planned-replacement contact lenses. Contact Lens & Anterior Eye 1999;22,4:155.

Jones L, Jones D, Simpson T. The influence of replacement frequency and care regimens on subjective satisfaction with disposable/frequent replacement lenses. Contact Lens & Anterior Eye 1999;22,4:147.

Jones D, Jones L, Simpson T. The subjective satisfaction of presbyopes wearing disposable/frequent replacement lenses: a comparison of monovision versus reading over-spectacles. Contact Lens & Anterior Eye 1999;22,4:162.

1998

Jones D, Jones L, Franklin V, Tonge S, Tighe B. Multi-purpose solution effects on the clinical performance and spoilation of daily-wear monthly planned replacement contact lenses. Optom Vis Sci 1998;75,12s:276.

Jones D, Jones L, Franklin V, Tonge S, Tighe B. Multi-purpose solution effects on the clinical performance and spoilation of daily-wear monthly planned replacement contact lenses. B&L ERS Symposium (Prague), 1998.

Jones D, Jones L, Franklin V, Tonge S, Tighe B. Multi-purpose solution effects on the clinical performance and spoilation of daily-wear monthly planned replacement contact lenses. Tenth Symposium on the Material Science and Chemistry of Contact Lenses (New Orleans), 1998.

1997

Jones L, Jones D, Langley C, Houlford M. The influence of solution regimes on the in vivo wettability of Group II and Group IV frequent replacement lenses. Contact Lens & Anterior Eye 1997;20171.

1996

Jones L, Jones D, Houlford M. A clinical comparison of three polyhexanide-preserved multi-purpose contact lens solutions. Optom Vis Sci 1996;73,12s:95.

Jones L, Jones D, Houlford M. A clinical comparison of three polyhexanide-preserved multi-purpose contact lens solutions. BCLA Conference (Birmingham, UK), 1996.

Jones L, Jones D, Houlford M. A clinical comparison of three polyhexanide-preserved multi-purpose contact lens solutions. B&L ERS Symposium (Seville), 1996.

Jones L, Jones D, Langley C, Houlford M. Reactive or proactive contact lens fitting - does it make a difference?. B&L Symposium (Seville), 1996.

1995

Jones L, Jones D, Langley C, Houlford M. Reactive or proactive contact lens fitting - does it make a difference?. Optom Vis Sci 1995;72,12s:146.

Jones D, Jones L. Problems, problems, problems. J BCLA 1995;18,4:139.

Jones L, Jones D, Langley C, Houlford M. Reactive or proactive contact lens fitting - does it make a difference?. BCLA Conference (London), 1995.

1994

Jones L, Jones D, Langley C. A comparative evaluation of two high Dk aspheric RGP contact lenses. J BCLA 1994;17,4:154.

Jones D, Jones L. Every picture tells a story. J BCLA 1994;17,4:154.

Jones L, Davies I, Jones D. The time dependent effect of hydrogen peroxide neutralisation on the fitting characteristics of group IV disposable lenses. B&L ERS (Lisbon), 1994.

Jones L, Jones D, Langley C. A comparative evaluation of two high Dk aspheric RGP contact lenses. B&L ERS (Lisbon), 1994.

1993

Jones L, Davies I, Jones D. Effect of hydrogen peroxide neutralisation times on the fitting characteristics of group IV disposable contact lenses. Opthal Physiol Opt 1993;14,1:108.

Professional Publications

2016

Morgan P, Woods C, Tranoudis I, Helland M, Efron N, Jones L, Teufl M, Grupcheva C, Lemos R, Jones D, Beeler-Kaupke M, Qi P, Tan K-O, Belikova J, Pult H, Ravn O, Santodomingo-Rubido J, Malet F, Plakitsi A, Vegh M, Erdinest N, Jafari A, Montani G, Itoi M, Sun B, Bendoriene J, van der Worp E, Pintor R, Monroy J, Chia J, Awasthi S, Lam W, Romualdex-Oo J, Abesamis-Dichoso C, Gonzalez-Meijome J, Gierow P, Stabuc Silih M, Hsiao J, Nichols J. International contact lens prescribing in 2015. Contact Lens Spectrum 2016;31(1):24-29.

2006

Morgan PB, Efron N, Woods CA, Jones D, Pesinova A, Grein HJ, Tranoudis IG, Chandrinos A, Itoi M, van_der_Worp E, Phillips G, Belousov V, Helland M, Thunholm-Henriksson IL, Ong A, Hung LK, Barr JT. International contact lens prescribing in 2005. Contact Lens Spectrum 2006;21,1:35-39.

Morgan P, Efron N, Woods C, Jones D, Pesnova A, Grein HJ, Tranoudis Y, Chandrinos A, Itoi M, van der Worp E, Phillips G, Belousov V, Helland M, Thunholm-Henricksson IL, Ong A, Hung L, Monatani G, Barr J. International contact lens prescribing in 2005. Contact Lens Spectrum 2006;21,1:35-39.

Morgan P, Efron N, Woods C, Jones D, Grin HJ, Tranoudis Y, Itoi M, van der Worp E, Phillips G, Belousov V, Helland M, Ghunholm-Henriksson IL, Yeo A, Barr J. What contact lenses are fitted today (and tomorrow)?. Global Contact Lens 2006;4212-15.

2005

Morgan PB, Efron N, Woods CA, Jones D, Grein HJ, Tranoudis Y, Monatani G, Marani E, Itoi M, van der Worp E, Phillips G, Helland M, Thunholm-Henriksson IL, Yeo Chee Hong A, Barr JT. International contact lens prescribing 2004. Contact Lens Spectrum 2005;20,1:34-37.

1995

Jones L, Jones D, Langley C, Houlford M. The subjective response of 100 consecutive patients to 1-day disposable lenses. Optician 1995;211,5536:28-32.

Jones L, Jones D, Langley C. The comparative performance of two aspheric rigid gas permeable lens designs. Optician 1995;210,5526:28-36.

Jones L, Jones D. Three and nine O'clock corneal staining. Optician 1995;210,5526:20-22.

Jones L, Jones D. Blepharitis. Optician 1995;210,5522:32-33.

Jones L, Jones D. RGP lens binding (adherence). Optician 1995;210,5517:28-29.

Jones L, Jones D. SMILE staining and dehydration. Optician 1995;210,5513:24-25.

Jones L, Jones D. Dimple-veil staining. Optician 1995;210,5509:32.

Jones L, Jones D. Superior epithelial arcuate lesions. Optician 1995;209,5500:32-33.

Jones L, Jones D. Corneal staining assessment. Optician 1995;209,5496:30-32.

Jones L, Jones D. Meibomian gland dysfunction. Optician 1995;209,5491:30-31.

1991

Jones L, Jones D. Persecon 92E: design and clinical performance. Optician 1991;203,5333:16-23.

Books

2007

Jones L, Jones D. Common Contact Lens Complications: Recognition and Management. Elsevier. 2007.

2001

Jones L, Jones D. Slit Lamp Biomicroscopy. In: The Cornea, ed. Nathan Efron. Butterworth-Heinemann. 2001.

2000

Jones L, Jones D. Common Contact Lens Complications: Recognition and Management. Butterworth-Heinemann. 2000.