September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Astigmatism and effect on progression of myopia
Author Affiliations & Notes
  • Padmaja Sankaridurg
    Brien Holden Vision Institute, Sydney, New South Wales, Australia
    School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
  • Arthur Ho
    Brien Holden Vision Institute, Sydney, New South Wales, Australia
    School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
  • thomas naduvilath
    Brien Holden Vision Institute, Sydney, New South Wales, Australia
  • Xiang Chen
    Zhongshan Ophthalmic Centre, Guangzhou, China
  • Earl L Smith
    College of Optometry, University of Houston, Houston, Texas, United States
  • Footnotes
    Commercial Relationships   Padmaja Sankaridurg, Brien Holden Vision Institute (E), Brien Holden Vision Institute (P); Arthur Ho, Brien Holden Vision Institute (E), Brien Holden Vision Institute (P); thomas naduvilath, Brien Holden Vision Institute (E); Xiang Chen, None; Earl Smith, US7025460 (P)
  • Footnotes
    Support  Australian Federal Govt through the CRC Scheme, Brien Holden Vision Institute, Zhongshan Ophthalmic Centre
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 2476. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to Subscribers Only
      Sign In or Create an Account ×
    • Get Citation

      Padmaja Sankaridurg, Arthur Ho, thomas naduvilath, Xiang Chen, Earl L Smith; Astigmatism and effect on progression of myopia. Invest. Ophthalmol. Vis. Sci. 2016;57(12):2476.

      Download citation file:


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

      ×
  • Supplements
Abstract

Purpose : To determine if baseline ocular astigmatism influences the progression of myopia in Chinese children with myopia

Methods : Children with myopia (n=141; 9.8 ± 1.5 yrs, range 6 to 12 yrs) enrolled in Vision CRC and BHVI myopia control studies conducted at Guangzhou, China. Only those wearing single vision spectacles, with spherical equivalent refractive error (SEQ) from -0.50 to -4.50D and astigmatism <2.00D were considered for the analysis. All children were fitted with single vision spectacles that corrected for baseline astigmatism (3.5D base curve). At baseline and 6 monthly intervals thereafter, measurements of cycloplegic (2 drops of 1% tropicamide) autorefraction and axial length were conducted on both eyes. To analyse astigmatism including magnitude and type, astigmatic components J, J0 and J45 were used. Relation if any between baseline astigmatism (type and magnitude) to change in sphere (D), SEQ (D) and axial length (mm) from baseline to 12 months was determined using linear mixed model. Statistical significance was defined as p<0.05.

Results : At baseline, mean SEQ was -2.39 ± 0.80D (range -0.43 to -4.31D). Astigmatism (J, J0 and J45) was 0.58 ± 0.38D, 0.10 ± 0.25D and 0.00± 0.22D, respectively. There was no correlation between baseline cylinder power to baseline sphere power (R2=0.0007). 94% of eyes had astigmatism. Of those, WTR astigmatism was the most frequent (48.5%) followed by oblique (27.1%) and ATR (24.4%). Change from baseline to 12 months for SEQ, sphere, J, J0 and J45 were -0.75 ± 0.43D, -0.71 ± 0.42D, -0.09 ±0.28D, 0.07 ± 0.26D and -0.01 ± 0.23D, respectively. There was no relation between baseline astigmatism (magnitude or type) to change in sphere, spherical equivalent or axial length from baseline to 12 months (p>0.05).

Conclusions : Previous studies found that certain types of inherent ocular astigmatism resulted in altered growth patterns and myopia thus suggesting that astigmatic defocus may influence myopia development and/or progression. In this limited sample of myopic eyes, a significant number of eyes had baseline astigmatism and mostly WTR but baseline ocular astigmatism was not related to progression of myopia. Also, shift in astigmatism was slight over 12 months.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×