July 2019
Volume 60, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2019
Effect of Defocus Incorporated Multiple Segments (DIMS) spectacle lens wear on visual functions in myopic children
Author Affiliations & Notes
  • Carly S Y Lam
    Centre for Myopia Research, School of Optometry, The Hong Kong Polytechnic Univ, Kowloon, Hong Kong
  • Wing Chun Tang
    Centre for Myopia Research, School of Optometry, The Hong Kong Polytechnic Univ, Kowloon, Hong Kong
  • Dennis Yan-yin Tse
    Centre for Myopia Research, School of Optometry, The Hong Kong Polytechnic Univ, Kowloon, Hong Kong
  • Rachel Ka-man Chun
    Centre for Myopia Research, School of Optometry, The Hong Kong Polytechnic Univ, Kowloon, Hong Kong
  • Chi Ho To
    Centre for Myopia Research, School of Optometry, The Hong Kong Polytechnic Univ, Kowloon, Hong Kong
  • Footnotes
    Commercial Relationships   Carly Lam, HOYA Corporation (Tokyo, Japan) (F), HOYA Corporation (Tokyo, Japan) (P); Wing Chun Tang, None; Dennis Tse, None; Rachel Ka-man Chun, None; Chi Ho To, HOYA Corporation (Tokyo, Japan) (F), HOYA Corporation (Tokyo, Japan) (P)
  • Footnotes
    Support  H-ZG3B
Investigative Ophthalmology & Visual Science July 2019, Vol.60, 5847. doi:https://doi.org/
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      Carly S Y Lam, Wing Chun Tang, Dennis Yan-yin Tse, Rachel Ka-man Chun, Chi Ho To; Effect of Defocus Incorporated Multiple Segments (DIMS) spectacle lens wear on visual functions in myopic children. Invest. Ophthalmol. Vis. Sci. 2019;60(9):5847. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : The Defocus Incorporated Multiple Segments (DIMS) spectacle lens slows myopia progression and axial elongation in myopic children in average by 60% over 2 years. This study evaluates and compares visual functions in myopic children after 2-year of wearing DIMS lenses.

Methods : Seventy-nine Chinese myopic (mean spherical equivalent refraction =-2.97± 0.97D) children (age 8 to 13 years) who participated in and completed a double-blinded randomized clinical trial of DIMS lenses were included. The children wore the DIMS lenses full-time (more than 10 hours per day) over 2 years. Their best corrected visual acuity, binocular visual functions and accommodation with full correction for distance were measured at baseline before lens wear and then repeated every 6 months over 2 years. Distance and near horizontal phoria were measured using Howell distance and near phoria cards. Amplitude of accommodation was measured by push-up method using the RAF rule. Lag of accommodation was evaluated using an open-field autorefractor. Visual functions at baseline and at 2-year were compared using paired t-tests.

Results : Improvement in best corrected distance visual acuity (mean difference = 0.09 ±0.06, p=0.00) and stereoacuity score (mean difference=5.72 ±14.34, p=0.02) were found after DIMS spectacle lens wear, but were clinically insignificant. There were no significant changes in mean near visual acuity, distance and near phoria, amplitude of accommodation and lag of accommodation (p>0.05) after two years of DIMS lens wear when compared to baseline.

Conclusions : The findings indicated that long-term wear of DIMS spectacle lens did not affect visual acuity, binocular function and accommodation while slowing myopia progression in myopic children.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.

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