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Submitted
August 2, 2019
Accepted
August 2, 2019
Published
August 2, 2019
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Abstract

Purpose:To determine post lasik aim of refraction in young myopic patient that ensure slight over correction (safe margin of hypermetropiaSMH) which help in reducing possibility of regressionand post lasik myopic shift, however this SMH should be easily overcomedby accommodation , doesn’t affect UCVA or induce eyestrain.
Patients and methods:400 patients (800 eyes) were taken in this study, all of them had myopia and myopic astigmatism with -1.0 to – 6.0 D(spherical equivalent) during the period between 2008-2014 in Nassirya city, south of Iraq. Those patients were divided into 5 groups each group with 80 patients (160 eyes) and planned to have post lasik refraction ofemmetrope,  +0.5, +0.75, +1.0 and +1.25 D, for groups from no.1 to no.5 respectively and these groups followed up in term of UCVA, spherical equivalent, myopic shift, and asthenopia (eyestrain) for three years.
Result:Three yearsfollow up for the 5 groups showed that, in group no.1 (27.5%)  of eyes had VA of 6/9 or worse, (33.125%)  of eyes had myopic shift and(11.25%) of patients had eyestrain. In group no.2 (19.375%) of eyes had VA of 6/9 or worse ( 21.875%) of eyes had myopic shift and (8.75%)  of patients had eyestrain. In group no.3 (11.25%)of eyes had VA of 6/9 or worse (9.375%) of eyes had myopic shift and (2.5%) of patients had eyestrain. In group no.4 ( 4.375%) of eyes had VA of 6/9 or worse, no myopic shift and (2.5%) of patients had eyestrain. In group no.5(12.5%) of eyes had VA of 6/9 or worse, no myopic shift and (15%) of patients had eye strain.
 Conclusion: In  young myopic patients with low to moderate myopia, we can choose post lasik aim of refraction of +1.0 D, this safe margin of hypermetropia SMH can ensure best UCVA without eyestrain (asthenopia), help in reducing regression and myopic shift.

Keywords

safe margin of hypermetropia regression asthenopia myopia Lasik

Article Details

References

  1. - Sutton Gl, Kim P. Laser in situ keratomileusis in 2010- a review. ClinExpOpthalmol 2010 Mar; 38(2):192-210.
  2. - O.J. Leuhumann, D.H. Verity,et al: Clinical optics and refraction , 1998: 60-61.
  3. - James F. Vander, MD: Ophthalmology secrets, second edition 2008: 123-132.
  4. - Kerry D. Solomon, Luis E. Fernandez de Castro, et al., Quality of life and patient satisfaction. American Academy of ophthalmology, Ophthalmology 2009 Apr; 116(4): 691-707.
  5. - McGhee CN, Craig JP, Sachdev N, Weed KH, Brown AD. Functional, psychological and satisfaction outcomes of laser in situ keratomileusis for high myopia. J Cataract Refract Surg. 2000;26:497-509.
  6. - James E. Sheedy, John Hayes, Jon Engle. Is all asthenopia the same. American academy of optometry, 2003; 80(11): 732-739.
  7. - Sugar A., Rapuano C.J., Culbertson W.W.,et. al., Laser in situ keratomileusis for myopia and astigmatism: Safety and Efficacy. A report by American Academy of Ophthalmology. Ophthalmology 2002; 109: 175-187.
  8. - Bailey MD, Mitchell GL, Dhaliwal DK, et. al. Patient satisfaction and visual symptoms after laser in situ keratomileusis. Ophthalmology 2003; 110: 1371-1378.
  9. - Takano M, Yoshida T, Omori K, Ogasawara K, Onodera T. Factors affecting the regression after laser in situ keratomileusis for myopia. Jap Orthopt J. 2005; 34:121-126.
  10. - Kim G, Christiansen SM, Moshirfar M. Change in keratometry after myopic laser in situ keratomileusis and photorefractive keratectomy. J Cataract Refractive surg. 2014 Apr; 40(4): 564-574.
  11. - Dirani M, Couper T, Yau J, et al. Long-term refractive outcomes and stability after excimer laser surgery for myopia. J Cataract Refract Surg. 2010 Oct; 36(10):1709-1717.
  12. - Perlman EM, Reinert SE. Factors influencing the need for enhancement after laser in situ keratomileusis. JCataract Refract Surg. 2004 Nov-Dec;20(6):783-789.
  13. - Pietila J, Huhtala A, Makineu P, Uusitalo H. Laser in situ keratomileusisenhancements with the Ziemer FEMTO LDV femtosecond laser following previous LASIK treatment. Graefes Arch ClinExp Ophthalmol.2013 Feb; 251(2):597-602.
  14. - Miyata K, Tokunaga T, Nakahara M, OhtaniS,Nejima R, et al., Residual bed thickness and corneal forward shift after laser in situ keratomileusis. J Cataract Refract Surg. 2004 May; 30(5):1067-1072.

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