Document Detail

Risk factors for night vision complaints after LASIK for myopia.
MedLine Citation:
PMID:  14711706     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To study the preoperative risk factors for night vision complaints (NVCs) after LASIK in a clinical setting. DESIGN: Retrospective noncomparative case series. PARTICIPANTS: Seven hundred ninety-five patients (1488 eyes) who underwent LASIK for myopia up to -9.75 diopters (D) (from January 1 to December 31, 1999). SETTING: Private clinic. METHODS: A complete preoperative examination was performed. Patients had bilateral LASIK surgery using the Nidek EC-5000 non-wavefront guided slit-scanning excimer laser and the Moria LSK One microkeratome. Patients were observed postoperatively for 12 months. MAIN OUTCOME MEASURES: The reported NVCs for each eye were rated on a subjective scale based on functional visual comfort. Clinically important NVC odds ratios (ORs) were calculated. RESULTS: Reports of NVCs decreased considerably from 25.6% at 1 month to 4.7% at 12 months postoperatively, at which time all patients reported similar NVCs in both eyes. Stratification of risk factors at 12 months postoperatively showed a 2.8-times increase in NVCs for initial myopia of >5 D, a 2.5-times increase for an optical zone of </=6.0 mm, and a 2.9-times increase for a postoperative spherical equivalent outside +/-0.5 D of emmetropia. The role of attempted spherical correction, age of the patient, and postoperative spherical equivalent had significant importance in logistic regression of the OR throughout the first postoperative year. In a stepwise logistic regression using 6- and 12-month data, attempted spherical correction and optical zone were the most predictive factors of NVCs (P<0.001). Pupil size at any month postoperatively was not statistically predictive of postoperative NVCs in any differential model involving it. CONCLUSIONS: Attempted degree of spherical correction, age, optical zone, and postoperative spherical equivalent were major risk factors of NVCs throughout the first postoperative year, whereas pupil size was not. Future wavefront studies that characterize higher order aberrations might be helpful for understanding individual visual aberrations while predicting quality of vision.
Mihai Pop; Yves Payette
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Ophthalmology     Volume:  111     ISSN:  0161-6420     ISO Abbreviation:  Ophthalmology     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2004-01-08     Completed Date:  2004-01-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7802443     Medline TA:  Ophthalmology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3-10     Citation Subset:  IM    
Michel Pop Clinics, Montreal, Canada.
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MeSH Terms
Age Factors
Cornea / physiopathology,  surgery*
Keratomileusis, Laser In Situ*
Middle Aged
Myopia / physiopathology,  surgery*
Night Blindness / etiology*,  physiopathology
Postoperative Complications*
Pupil / physiology
Retrospective Studies
Risk Factors
Visual Acuity
Comment In:
Ophthalmology. 2004 Jan;111(1):1-2   [PMID:  14711705 ]
Ophthalmology. 2004 Aug;111(8):1620-1; author reply 1621-2   [PMID:  15289001 ]
Ophthalmology. 2004 Aug;111(8):1619-20; author reply 1920   [PMID:  15288999 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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