Citation:Zhang YL,Liu L,Cui CX,Hu M,Li ZN,Cao LJ,Xiu-Hua,Jing,Mu GY.Comparative study of visual acuity and aberrations after intralase femtosecond LASIK:small corneal flap versus big corneal flap.Int J Ophthalmol 2013;6(5):641-645,doi:10.3980/j.issn.2222-3959.2013.05.16
Comparative study of visual acuity and aberrations after intralase femtosecond LASIK:small corneal flap versus big corneal flap
Received: October 11, 2012  Revised: August 16, 2013
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DOI:10.3980/j.issn.2222-3959.2013.05.16
Key Words:femtosecond laser  laser in situ keratomileusis  refractive surgery  flap  visual acuity  aberration
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Ya-Li Zhang Department of Ophthalmology, Shandong Provincial Hospital affiliated to Shandong University, No.324 Jingwuweiqi Road, Jinan 250021, Shandong Province, China
;Department of Ophthalmology, The Second People’s Hospital of Jinan, 148 Jingyi Road, Jinan 250001, Shandong Province, China
 
Lei Liu Department of Ophthalmology, The Second People’s Hospital of Jinan, 148 Jingyi Road, Jinan 250001, Shandong Province, China
 
Chang-Xia Cui Department of Health Examination, Jinan Central Hospital affiliated to Shandong University, No.105 Jiefang Road, Jinan 250013, Shandong Province, China 
Ming Hu Department of Ophthalmology, The Second People’s Hospital of Jinan, 148 Jingyi Road, Jinan 250001, Shandong Province, China
 
Zhao-Na Li Department of Ophthalmology, The Second People’s Hospital of Jinan, 148 Jingyi Road, Jinan 250001, Shandong Province, China
 
Li-Jun Cao Department of Ophthalmology, The Second People’s Hospital of Jinan, 148 Jingyi Road, Jinan 250001, Shandong Province, China
 
Xiu-Hua  
Jing Department of Ophthalmology, The Second People’s Hospital of Jinan, 148 Jingyi Road, Jinan 250001, Shandong Province, China
 
Guo-Ying Mu Department of Ophthalmology, Shandong Provincial Hospital affiliated to Shandong University, No.324 Jingwuweiqi Road, Jinan 250021, Shandong Province, China
 
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Abstract:
      AIM: To study the effect of different flap sizes on visual acuity, refractive outcomes, and aberrations after femtosecond laser for laser in situ keratomileusis (LASIK).

    METHODS: In each of the forty patients enrolled, 1 eye was randomly assigned to receive treatment with a 8.1mm diameter corneal flap, defined as the small flap, while the other eye was treated with a 8.6mm diameter corneal flap, defined as the big flap. Refractive errors, visual acuity, and higher-order aberrations were compared between the two groups at week 1, month 1 and 3 postoperatively.

    RESULTS: The postoperative refractive errors and visual acuity all conformed to the intended goal. Postoperative higher-order aberrations were increased, especially in spherical aberration (Z12) and vertical coma (Z7). There were no statistically significant differences between the two groups in terms of postoperative refractive errors, visual acuity, root mean square of total HOAs (HO-RMS), trefoil 30° (Z6), vertical coma (Z7), horizontal coma (Z8), trefoil 0° (Z9), and spherical aberration (Z12) at any point during the postoperative follow-up.

    CONCLUSION: Both the small and big flaps are safe and effective procedures to correct myopia, provided the exposure stroma meets the excimer laser ablations. The personalized size corneal flap is feasible, as we can design the size of corneal flap based on the principle that the corneal flap diameter should be equal to or greater than the sum of the maximum ablation diameter and apparatus error.

PMC FullText Html:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3808912/
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