Downward deviation of progressive addition lenses in a myopia control trial

Hasebe, Shinji; Nakatsuka, C.; Hamasaki, Ichiro; Ohtsuki, Hiroshi

doi:10.1111/j.1475-1313.2005.00301.x

Cited by 24 publications

(13 citation statements)

References 15 publications

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“…Recent clinical studies investigating the effect of bifocal soft contact lenses on myopia progression in children and young adults (Aller, 2000; Aller and Grisham, 2000; Aller and Wildsoet, 2006, 2007) have reported much greater treatment effects than seen in related spectacle lens studies. That the young subjects in previous bifocal and PAL spectacle trials did not use the reading portion of their spectacles correctly is one of a number of possible explanations for the poorer results in these trials, being consistent with observations that children do not consistently use the near addition portion of their spectacles during reading (Hasebe et al. , 2005).…”

Section: Introductionsupporting

confidence: 76%

Accommodation in emmetropic and myopic young adults wearing bifocal soft contact lenses

Tarrant

Severson

Wildsoet

2008

Ophthalmic Physiologic Optic

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Purpose: To assess the effect of bifocal soft contact lenses on the accommodative errors (lags) of young adults. Recent studies suggest that bifocal soft contact lenses are an effective myopia control treatment although the underlying mechanism is not understood. Methods: Accommodation responses were measured for four target distances: 100, 50, 33 and 25 cm in 35 young adult subjects (10 emmetropes and 25 myopes; mean age, 22.8 ± 2.5 years). Measurements were made under both monocular and binocular conditions with three types of lenses: single vision distance soft contact lenses (SVD), single vision near soft contact lenses (SVN; +1.50 D added to the distance prescription) and bifocal soft contact lenses (BF; +1.50 D add). Results: For the SVD lenses, all subjects exhibited lags of accommodation, with myopes accommodating significantly less than emmetropes for the 100 and 50 cm target distances (p < 0.05). With the SVN lenses, there was no significant difference in accommodative responses between emmetropes and myopes. With the BF lenses, both emmetropic and myopic groups exhibited leads in accommodation for all target distances, with emmetropes showing significantly greater leads for all distances (p < 0.005). Conclusions: Overall, myopes tended to accommodate less than emmetropes, irrespective of the contact lens type, which significantly affected accommodation for both groups. The apparent overaccommodation of myopes when wearing the BF contact lenses may explain the reported efficacy as a myopia control treatment, although further studies are required to elucidate the mechanism underlying this accommodative effect.

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Section: Introductionsupporting

confidence: 76%

Accommodation in emmetropic and myopic young adults wearing bifocal soft contact lenses

Tarrant

Severson

Wildsoet

2008

Ophthalmic Physiologic Optic

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“…This problem is worsened if the spectacles slip downward as frequently occurs in children wearing glasses. The study of Hasebe and colleagues 55 confirmed that children who wear multifocal lenses do not consistently use the near‐addition portion of the spectacles during reading, which means that their lag of accommodation is not controlled for a large amount of the time. In contrast to multifocal lenses, the segment line of bifocals provides feedback to the children, enabling them to deliberately choose the reading portion for near work.…”

Section: Value Of Bifocal Over Multifocal Lens Designsmentioning

confidence: 98%

Bifocal lens control of myopic progression in children

Cheng

Woo

Schmid

2011

Clinical and Experimental Optometry

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Bifocal spectacle lenses have been used as a strategy to slow myopic progression in children since the 1950s and perhaps earlier. The reported success of this strategy varies greatly, as does the design of studies reporting the outcomes of their use-from earlier retrospective analysis of records to later prospective clinical trials. Collectively, published data support the suggestion that bifocal lenses inhibit myopic development in children but only by a small amount and only in a subset of children. Possible reasons for the greatly varying outcomes include a lack of individualism of the treatment and failure to take the vergence system into account. This review summarises the results of bifocal and multifocal studies, describes how accommodation, convergence and their interaction are linked to myopic development and details how a bifocal treatment that takes this into account may be devised. Also discussed is whether alterations to peripheral retinal blur contribute to bifocal lens effects.

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“…Even in myopia control studies with careful training protocols in place, children frequently misuse PALs by failing to use the near zone for near viewing. 23 -8.00 Figure 2 Shows the power profiles for a single vision soft contact lens with additional minus power in the periphery, a lens with a flat optical profile and a lens with additional peripheral plus power. Also shown are the myopia progression rates associated with such lenses from several studies.…”

Section: Clinical Strategiesmentioning

confidence: 99%

Clinical management of progressive myopia

Aller

2013

Eye

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Myopia has been increasing in prevalence throughout the world, reaching over 90% in some East Asian populations. There is increasing evidence that whereas genetics clearly have an important role, the type of visual environment to which one is exposed to likely influences the onset, progression, and cessation of myopia. Consequently, attempts to either modify the environment or to reduce the exposure of the eye to various environmental stimuli to eye growth through the use of various optical devices are well under way at research centers around the globe. The most promising of current treatments include low-percentage atropine, bifocal soft contact lenses, orthokeratology, and multifocal spectacles. These methods are discussed briefly and are then categorized in terms of their expected degree of myopia progression control. A clinical strategy is presented for selecting the most effective treatment for the appropriate type of patient at the optimal stage of refractive development to achieve the maximum control of myopia progression.

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Downward deviation of progressive addition lenses in a myopia control trial

Cited by 24 publications

References 15 publications

Accommodation in emmetropic and myopic young adults wearing bifocal soft contact lenses

Accommodation in emmetropic and myopic young adults wearing bifocal soft contact lenses

Bifocal lens control of myopic progression in children

Clinical management of progressive myopia

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