Study Of Phoria And Relative Convergence In Myopia

Objective:Through measure the level phoria,relative convergence,accmodative convergence/accommodative(AC/A) of the myope pro-LASIK to compare the difference between different correction mode and different diopter,in order to improve the design of LASIK and better myopia correction.Methods:A total of 107 myope pro-LASIK was colleceted in the study.All the myope was separated by correction mode and spherical equivalent:Glasses group (marked G group) 76 patients,include low myopia(<-3.0D) 16 patient,moderate myopia(-3.0D～-6.0D) 40 patient,high myopia(>-6.0D) 20 patients;Corneal contact lens group(marked C group) 31 patients,include moderate myopia(-3.0D～-6.0D) 12 patients,high myopia(>-6.0D) 19 patients. Measure distant and near level phoria,distant and neat relative convergence,AC/A.Compare them with Morgan value and within groups.Results:1.The distant level phoria(DLP) of G group,C group compared with Morgan value had significant differences(P< 0.05);there were no significant differences of DLP between the different diopter of G and C groups(P> 0.05);there were no significant differences of DLP between the same diopter in G and C groups(P>0.05).2.The near level phoria(NLP) of G group compared with Morgan value had significant differences(<0.05) but didn't with C group(P>0.05); there were no significant differences of NP between the different diopter of G and C groups(P> 0.05);there were no significant differences of NLP between the same diopter in G and C groups(P>0.05). 3.The distant positive relative convergence(PRC) of G group,C group compared with Morgan value had significant differences(P<0.05); there were no significant difference of distant PRC between the different diopter of G and C groups(P>0.05);there were no significant differences of distant PRC between the same diopter in G and C groups(P> 0.05).4.The distant negative relative convergence(NRC) of G group,C group compared with Morgan value had significant differences(P< 0.05); there were no significant differences of distant NRC between the different diopter of G and C groups(P> 0.05);there were significant differences of distant NRC with high myopia in G and C groups(P<0.05) but not with moderate myopia(P>0.05).5.The near positive relative convergence(PRC) of G group,C group compared with Morgan value had no significant differences(P>0.05); there were no significant difference of near PRC between the different diopter of G and C groups(P>0.05);there were no significant differences of near PRC between the same diopter in G and C groups(P> 0.05).6.The near negative relative convergence(NRC) of G group,C group compared with Morgan value had significant differences(P<0.05); there were no significant differences of near NRC between the different diopter of G and C groups(P>0.05);there were significant differences of near NRC with high myopia in G and C groups(P< 0.05) but not with moderate myopia(P>0.05).7.There were significant differences between the AC/A of G group with Morgan value(P< 0.05) but C group were not(P> 0.05);there were no significant differences of AC/A between the different diopter of G and C groups(P>0.05);there were significant differences of the AC/A between G and C groups; there were significant differences of the AC/A with moderate myopia in G and C groups(P<0.05) but not with high myopia(P> 0.05).Conclusions:l.The distant level phoria,distant positive and negative relative convergence,near negative relative convergence of the myope pro-LASIK who wear glasses or corneal contact lens are different form the normal value, and the near level phoria of the patients are also different from the normal value. 2.The myope pro-LASIK with high myopia who wear corneal contact lens have large distant and near negative relative convergence than who wear glasses.3.The AC/A of the myope pro-LASIK who wear glasses not only lower thanthe normal value of th AC/A but also lower than the AC/A of who wear corneal contact lens.