Assessment of contrast sensitivity loss after intrastromal femtosecond laser and LASIK procedure
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David C. K. Chang. Taiwan Nobel Eye Institute, #13 Gongyuan Rd. Taipei 100, Taiwan, China. chaokai@nobelgroup.com.tw

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    Abstract:

    AIM: To assess the loss of contrast sensitivity (CS) function for INTRACOR or intrastromal femtosecond laser presbyopia procedure to conventional LASIK procedures. METHODS: Patients were recruited from a refractive surgery center for either INTRACOR or conventional LASIK. INTRACOR was performed on 8 eyes and LASIK was performed for 40 eyes in an overlapping period. Pre-operative evaluation and post-operative follow up for up to three months was done. Drops of CS in 4 spatial frequency (3 cpd, 6 cpd, 12 cpd and 18 cpd) right before and 3mo after the surgery were compared by Wilcoxon signed ranks test. RESULTS: For INTRACOR, CS threshold showed significant drop at both glare and non-glare condition, the drop was seen in all 4 spatial frequency. The averaged loss over the 4 spatial frequencies 3mo after surgery was 1.18 for non-glare and 0.71 for glare. For LASIK the CS threshold drop was most significant in 12 cpd for glare. CONCLUSION: INTRACOR procedure produces a gain of near vision for presbyopia patients but also introduces a high lost of contrast sensitivity plus worsen of vision quality. Pre-surgical patient selection and advise should be given with specific regards to night driving and glare conditions.

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Elsa L. C. Mai, Ie-Bin Lian, David C. K. Chang. Assessment of contrast sensitivity loss after intrastromal femtosecond laser and LASIK procedure. Int J Ophthalmol, 2016,9(12):1798-1801

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Publication History
  • Received:February 02,2016
  • Revised:June 12,2016
  • Adopted:
  • Online: December 07,2016
  • Published: