June 2015
Volume 56, Issue 7
Free
ARVO Annual Meeting Abstract  |   June 2015
Bioptics - pursuing emmetropia in patients with high myopic astigmatism
Author Affiliations & Notes
  • Kraig S Bower
    Ophthalmology, Wilmer Eye Institute, Lutherville, MD
  • Denise S Ryan
    Warfighter Refractive Eye Surgery Program and Research Center, Fort Belvoir, VA
  • Rose Kristine Sia
    Warfighter Refractive Eye Surgery Program and Research Center, Fort Belvoir, VA
  • Paul Houghtaling
    Ophthalmology, Wilmer Eye Institute, Lutherville, MD
  • Scott McClellan
    Ophthalmology, Kimbrough Ambulatory Care Center, Fort Meade, MD
  • Bruce Rivers
    Warfighter Refractive Eye Surgery Program and Research Center, Fort Belvoir, VA
  • Footnotes
    Commercial Relationships Kraig Bower, None; Denise Ryan, None; Rose Sia, None; Paul Houghtaling, None; Scott McClellan, None; Bruce Rivers, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 3943. doi:
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      Kraig S Bower, Denise S Ryan, Rose Kristine Sia, Paul Houghtaling, Scott McClellan, Bruce Rivers; Bioptics - pursuing emmetropia in patients with high myopic astigmatism. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):3943.

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

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Abstract
 
Purpose
 

To analyze refractive outcomes of highly myopic astigmats an average of 566 days post-operatively after first undergoing phakic intraocular lens implantation for myopia followed three months later by WFG PRK or LASIK.

 
Methods
 

Five women and two men (14 eyes) with a mean age 28.3 years (range 21-45), and an average spherical equivalent refraction of -10.78 diopters (D) ± 1.85 D and average cylinder of 2.80 D ± 0.76 D underwent dual refractive procedures. First an implantable collamer lens was inserted through a self sealing corneal incision. Three months or more post-implantation, after documenting refractive stability, four patients underwent WFG (VISX CustomVue STAR S4 IR) PRK (three with mitomycin-C) and three underwent WFG LASIK. Uncorrected distance visual acuities (UDVA), manifest refraction (MR), corrected distance visual acuities (UDVA), corneal topography, corneal pachymetry, wavefront higher order aberrations (HOA), and endothelial cell densities (ECD) were determined preoperatively and postoperatively.

 
Results
 

Final visual outcomes [mean 566 days (range 347-898 days)], 14/14 eyes (100%) achieved UDVA of 20/20 or better and 8/14 (57%) achieved UDVA of 20/15 or better. No eye lost more than one line of corrected distance visual acuity (CDVA). Regression analysis showed strong correlation between attempted and achieved refractive correction (R2=0.98). Manifest Refractive Spherical Equivalent (MRSE) were within 0.50 D of emmetropia in 86% of eyes and were within 1.00 D of emmetropia in 100% of eyes. Postoperative refractive cylinder was less than 0.50 D in 93% and less than 1.00 D in 100% of treated eyes. Regression analysis showed a strong correlation between target induced astigmatism and surgically induced astigmatism (R2=0.89). Between six months and the final postoperative visit, refractive stability was achieved in 83% of eyes. Pre and postoperative keratometry, pachymetry, HOA, and ECD results are shown in Table 1.

 
Conclusions
 

Refractive correction using bioptics enabled effective treatment of high myopia with astigmatism with excellent predictability and few adverse effects in the intermediate term. This approach can be appropriate in settings where laser vision correction as a sole procedure is inadvisable and where a toric phakic IOL is not available.  

 
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