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

Tarrant, Janice; Severson, Holly; Wildsoet, Christine F.

doi:10.1111/j.1475-1313.2007.00529.x

Cited by 70 publications

(74 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was shown by the lag being the same with and without the lens. This is similar to the findings made by Tarrant et al [29].…”

Section: Discussionsupporting

confidence: 92%

“…However, the effect that these lenses might have on the accommodative response in younger subjects is still not fully known. Tarrant et al [29] have found that young adult subjects (535 years of age) fitted with bifocal soft center distance contact lenses do not relax their accommodation by the amount of the reading addition, i.e. the subjects continued to accommodate even though they did not need to.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Accommodation in young adults wearing aspheric multifocal soft contact lenses

Pettersson

Ramsay

Lundström

et al. 2011

Journal of Modern Optics

View full text Add to dashboard Cite

The aim of the present project was to investigate accommodative behavior in young adults and adolescents fitted with an aspheric multifocal (center distance) contact lens with focus on evaluating whether these lenses can be an alternative treatment for subjects in which a reduced level of blur and thereby accommodation in near vision is aimed at. Twenty normal subjects aged between 21 and 35 years participated in the study. Aberrometry was perfomed using a Zywave TM aberrometer, first on the uncorrected eyes of all subjects, and again while the subjects wore a multifocal contact lens with a þ1.00 add. A Shin-Nippon N Vision-K 5001 Autoref-Keratometer was used to measure accommodative response with two different refractive corrections: (1) habitual spectacle correction only, and (2) habitual correction and a aspheric multifocal (center distance) contact lens. Four hours of adaptation to the lens was allowed. The lag when wearing only the habitual spectacles was compared with the lag while wearing both the habitual spectacles and the aspheric multifocal contact lens. The mean lag of accommodation for the subject group was 0.85 D (AE0.57 SD) and 0.75 D (AE0.52 SD) without and with the multifocal lens, respectively. Statistical analyses showed no difference in lag (t ¼ 0.8479, p ¼ 0.407) with and without the lens. In conclusion, young normal subjects do not relax accommodation when fitted with aspheric multifocal center distance lenses when the addition is þ1.00. It is therefore unlikely that subjects with accommodative ability, in whom the treatment purpose is to reduce blur and thereby accommodation, can be effectively treated with such lenses.

show abstract

“…This was shown by the lag being the same with and without the lens. This is similar to the findings made by Tarrant et al [29].…”

Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 97%

Accommodation in young adults wearing aspheric multifocal soft contact lenses

Pettersson

Ramsay

Lundström

et al. 2011

Journal of Modern Optics

View full text Add to dashboard Cite

show abstract

“…12-14 While multiple studies have demonstrated efficacy in myopia control using multifocal lenses, 13-16 only a few studies have evaluated accommodative and binocular outcomes with multifocal contact lenses in non-presbyopic subjects, and with mixed results. One study of young adults (mean age: 22.8 ± 2.5 years) showed that myopes wearing +1.50 D multifocal lenses exhibited leads of accommodation, 17 while another study on adults (age 25 to 35 years) showed no statistically significant differences in accommodative response between single vision and multifocal contact lenses. 18 In a recent study, Kang et al found accommodative lags of 0.63 D, 1.12 D and 0.82 D for a target at 33 cm with single vision distance, +1.50 D, and +3.00 D multifocal contact lenses, respectively, in a cohort of 18 to 28 year olds.…”

mentioning

confidence: 99%

Accommodation and Phoria in Children Wearing Multifocal Contact Lenses

Gong

Troilo²,

Richdale³

2017

Optom Vis Sci

View full text Add to dashboard Cite

Purpose To determine the effect of multifocal contact lenses on accommodation and phoria in children. Methods This was a prospective, non-dispensing, randomized, crossover, single visit study. Myopic children with normal accommodation and binocularity and no history of myopia control treatment were enrolled and fitted with Coopervision Biofinity single vision (SV) and multifocal (MF, +2.50D center distance add) contact lenses. Accommodative responses (photorefraction) and phorias (Modified Thorington) were measured at 4 distances (>3m, 100cm, 40cm, 25cm). Secondary measures included high and low contrast logMAR acuity, accommodative amplitude and facility. Differences between contact lens designs were analyzed using repeated measures regression and paired t-tests. Results A total of 16 subjects, aged 10-15 years, completed the study. There was a small decrease in high (SV: -0.08, MF: +0.01) and low illumination (SV:-0.03, MF: +0.08) (both p<0.01) visual acuity, and contrast sensitivity (SV: 2.0, MF: 1.9 log units, p=0.015) with multifocals. Subjects were more exophoric at 40 cm (SV: -0.41, MF: -2.06 Δ) and 25cm (SV: -0.83, MF: -4.30 Δ) (both p<0.01). With multifocals, subjects had decreased accommodative responses at distance (SV: -0.04; MF: -0.37 D, p=0.02), 100 cm (SV: +0.37; MF: -0.35 D, p<0.01), 40 cm (SV: +1.82; MF: +0.62 D, p<0.01), and 25 cm (SV: +3.38; MF: +1.75 D, p<0.01). There were no significant differences in accommodative amplitude (p=0.66) or facility (p=0.54). Conclusions Children wearing multifocal contact lenses exhibited reduced accommodative responses and more exophoria at increasingly higher accommodative demands than with single vision contact lenses. This suggests that children may be relaxing their accommodation and using the positive addition or increased depth of focus from added spherical aberration of the multifocals. Further studies are needed to evaluate other lens designs, different amounts of positive addition and aberrations, and long-term adaptation to lenses.

show abstract

“…Many of the commercially available multifocal lenses in the US are center-near designs (full add power in the center transitioning to the distance power in the periphery), which is opposite of the desired power profile to reduce peripheral hyperopic defocus. Center-distance concentric ring designs (alternating rings of full distance and full near power) provide a peripheral myopic shift in defocus; however, autorefraction measurements of concentric ring designs have been reported to be variable, 31, 34 possibly due to the close spacing of the alternating distance and near zones. Peripheral defocus has been successfully measured through lenses that include a gradient increase in add power, 32 including the commercially available Proclear Multifocal “D” hydrogel lens (CooperVision, Fairport, NY).…”

mentioning

confidence: 99%

Peripheral Defocus with Spherical and Multifocal Soft Contact Lenses

Berntsen¹,

Kramer

2013

Optometry and Vision Science

View full text Add to dashboard Cite

Purpose To describe peripheral defocus when myopic eyes are corrected with spherical and center-distance multifocal soft contact lenses while looking at distance and near. Methods Twenty-five young adults with spherical contact lens-corrected refractive error of −0.50 to −6.00 D participated. Refractive error of each participant’s right eye was measured while it wore a spherical soft contact lens (Biofinity) and again while it wore a center-distance multifocal soft contact lens with a +2.50-D add (Biofinity Multifocal "D"). Measurements were made centrally and along the horizontal meridian at ±20°, ±30°, and ±40° from the line of sight at distance and near (3.33-D demand). Results The mean (±SD) age and spherical equivalent refractive error were 23.8 ± 1.3 years and −3.62 ± 1.56 D, respectively. At distance, the multifocal contact lens resulted in significantly more myopic defocus than the spherical contact lens at the 40° and 30° locations on the nasal retina and at the 20° and 30° locations on the temporal retina (p<0.0001). When accommodating to a near target, peripheral defocus was more myopic with the multifocal lens than with the spherical lens (p<0.0001). When viewing the near target with the spherical lens, participants experienced foveal hyperopic defocus and peripheral hyperopic defocus at all but one peripheral location. While participants also experienced foveal hyperopic defocus with the multifocal when looking at near, peripheral defocus was minimal (not significantly different than zero) at several locations (i.e., peripheral emmetropia). Conclusions The center-distance multifocal lens created peripheral myopic defocus when looking at distance. When looking at near, the multifocal lens resulted in relatively more myopic (less hyperopic) peripheral defocus than the spherical lens. The defocus profiles experienced with the multifocal contact lens in this study make it a good candidate for studies seeking to examine the effect of peripheral myopic defocus on myopia progression in children.

show abstract

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

Cited by 70 publications

References 38 publications

Accommodation in young adults wearing aspheric multifocal soft contact lenses

Accommodation in young adults wearing aspheric multifocal soft contact lenses

Accommodation and Phoria in Children Wearing Multifocal Contact Lenses

Peripheral Defocus with Spherical and Multifocal Soft Contact Lenses

Contact Info

Product

Resources

About