title: Physiological disproportions between un-corrected vision and degree of myopia.
abstract: BACKGROUND
  Anomalies of the refractive state of the eye are the commonest cause of defective vision.
  
  
  OBJECTIVE
  To study the relationship between uncorrected visual acuity and refractive error in myopia in children, the prevalence of disparity between them and to find out the possible explanation for it.
  
  
  METHODS
  100 eyes of 50 myopic children were studied and analyzed to study relationship between the uncorrected visual acuity (UCVA) and its refractive status. 42 cases were chosen to study disparity, either in the form of uncorrected visual acuity or refractive error. To study these disparities, Keratometery for anterior corneal curvature and A-scan for axial length and anterior chamber depth were also done.
  
  
  METHODS
  The results were analyzed statistically using student t-test while the relationship between uncorrected visual acuity (UCVA) and refractive error in myopia was obtained with Spearman's correlation coefficient (R).
  
  
  RESULTS
  The strength of association of uncorrected visual acuity and myopia as indicated by the correlation coefficient (0.897, p less than 0.001) is a significant one. Out of 42 cases taken to study disparity, 24 (57 %) cases showed discrepancy either in the form of uncorrected visual acuity or refractive error. The reason for this disparity as proven statistically in our study is increased axial length (p value less than 0.001).
  
  
  CONCLUSIONS
  There exists a linear relationship between UCVA and myopia, yet an accurate prediction of uncorrected visual acuity cannot be made on the basis of the refractive error or vice-versa for any single individual, as there exists a disparity either in form of UCVA or refractive error in myopia.
authors.affiliation: JN Medical College, AMU, Aligarh, India.
authors.forename: Y
authors.initials: Y
authors.lastname: Gupta
authors.forename: S A R
authors.initials: SA
authors.lastname: Rizvi
authors.forename: M
authors.initials: M
authors.lastname: Gupta
mesh_terms: D000293:Adolescent; D000867:Anterior Chamber / Q000473:pathology; D058452:Axial Length, Eye / Q000473:pathology; D002648:Child; D003315:Cornea / Q000473:pathology; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D009216:Myopia / Q000453:epidemiology* / Q000473:pathology* / Q000503:physiopathology; D015995:Prevalence; D011446:Prospective Studies; D012720:Severity of Illness Index; D014792:Visual Acuity