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International survey of contact lens prescribing for extended wear

Efron N, Morgan PB, Woods CA, International Contact Lens Prescribing Survey Consortium

Optom Vis Sci, 2012 Feb;89(2):122-9.
PMID: 22179218

PURPOSE: To determine the extent of extended wear (EW) contact lens prescribing worldwide and to characterize the associated demographics and fitting patterns.
METHODS: Up to 1000 survey forms were sent to contact lens fitters in up to 39 countries between January and March every year for five consecutive years (2006-2010). Practitioners were asked to record data relating to the first 10 contact lens fits or refits performed after receiving the survey form. Survey data collected since 1997 was also analyzed to assess EW fitting trends since that time.
RESULTS: Details for lens modality were received for 107,094 rigid and soft lens fits of which 88,392 were for soft lens daily wear (DW) and 7470 were for soft lens EW. Overall, EW represents 7.8% of all soft lens fits, ranging from 0.6% in Malaysia to 27% Norway. Compared with DW fittings, EW fittings can be characterized as follows: older age (32.7 ± 13.6 vs. 29.4 ± 12.0 years for DW); males are over-represented; greater proportion of refits; 72% silicone hydrogel; higher proportion of presbyopia and spherical designs; and higher proportion of monthly lens replacement. Of those wearing EW lenses, 80% use multipurpose solutions, whereas 9% do not use any care system. Between 1997 and 1999, the rate of EW prescribing decreased from 5 to 1% of all soft lens fits; it increased to a peak of 12% in 2006, and settled back to 8% by 2010.
CONCLUSIONS: EW prescribing has failed to break through the "glass ceiling" of 15% and is unlikely to become a mainstream lens wearing modality until the already low risks of ocular complications can be reduced to be equivalent to that for DW.
International survey of rigid contact lens fitting

Efron N, Morgan PB, Woods CA, International Contact Lens Prescribing Survey Consortium

Optom Vis Sci, 2013 Feb;90(2):113-8.
PMID: 23262991 DOI: 10.1097/OPX.0b013e31827cd8be

PURPOSE: To determine the extent of rigid contact lens fitting worldwide and to characterize the associated demographics and fitting patterns.
METHODS: Survey forms were sent to contact lens fitters in up to 40 countries between January and March every year for five consecutive years (2007 to 2011). Practitioners were asked to record data relating to the first 10 contact lens fits or refits performed after receiving the survey form. Survey data collected between 1996 and 2011 were also analyzed to assess rigid lens fitting trends in seven nations during this period.
RESULTS: Data were obtained for 12,230 rigid and 100,670 soft lens fits between 2007 and 2011. Overall, rigid lenses represented 10.8% of all contact lens fits, ranging from 0.2% in Lithuania to 37% in Malaysia. Compared with soft lens fits, rigid lens fits can be characterized as follows: older age (rigid, 37.3 ± 15.0 years; soft, 29.8 ± 12.4 years); fewer spherical and toric fits; more bifocal/multifocal fits; less frequent replacement (rigid, 7%; soft, 85%); and less part-time wear (rigid, 4%; soft, 10%). High-Dk (contact lens oxygen permeability) (36%) and mid-Dk (42%) materials are predominantly used for rigid lens fitting. Orthokeratology represents 11.5% of rigid contact lens fits. There has been a steady decline in rigid lens fitting between 1996 and 2011.
CONCLUSIONS: Rigid contact lens prescribing is in decline but still represents approximately 10% of all contact lenses fitted worldwide. It is likely that rigid lenses will remain as a viable, albeit increasingly specialized, form of vision correction.
Are eye-care practitioners fitting scleral contact lenses?

Woods CA, Efron N, Morgan P, International Contact Lens Prescribing Survey Consortium

Clin Exp Optom, 2020 07;103(4):449-453.
PMID: 32519339 DOI: 10.1111/cxo.13105

BACKGROUND: To determine the extent of scleral lens fitting worldwide and to characterise the associated patient demographics.
METHODS: Survey forms were sent to contact lens fitters around the world, every year for 20 consecutive years (2000 to 2019). Practitioners were asked to record data relating to the first 10 contact lens fits or refits performed after receiving the survey. Data were analysed for those countries reporting ≥ 1,000 contact lens fits during this period.
RESULTS: A total of 369,209 contact lens fits were recorded from 40 eligible countries, comprising 2,309 scleral lens fits and 366,900 other (non-scleral) lens fits. Overall scleral lenses represented 0.76 per cent of all contact lens fits with significant differences between countries (p lenses were fit to older patients (38.5 ± 15.0 years) compared to other lenses (31.4 ± 13.7 years) (p lenses 33 per cent, p lenses more likely to be fitted to males and older patients than non-scleral lenses.

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