Využití elektrofyziologických metod pro hodnocení zrakové ostrosti (sVEP)

Project Identification
MUNI/A/0886/2012
Project Period
1/2013 - 12/2013
Investor / Pogramme / Project type
Masaryk University
MU Faculty or unit
Faculty of Medicine
Keywords
visual acuity optotype letters refractive error visual evoked potentials

method sVEP enables quickly determine objective values of patient’s visual acuity. We divided our sample into two groups. In first group was measured visual acuity with sVEP and Snellen method only on one patient twelve times. In the second group was measured visual acuity twice with sVEP and next time twice with Snellen method with Landolt rings and logMAR modification. We measured 32 non-pathological patients. Results show significant differences between average values of visual acuity gained with both methods (sVEP and Snellen) in both samples (T-test, p < 0,01, resp. Wilcoxonův test, p = 0,02 in second group). In the second group we showed significant correlations between repeated sVEP measurements (Spearman test, p < 0,05, r = 0,69) but no signifiant correlation between average sVEP measurement and average Snellen measurement (Spearman test, p > 0,05, r = 0,15). Objective measurement of visual acuity with sVEP is valid and repeatable method, but we recommend use it only in case, when is not possible to use subjective method for measuring of visual acuity, e.g. children, people with mental retardation or simulating/dissimulating people.

Results

Visual acuity determination is important task in ophthalmology and optometry practice. Examination method sVEP enables quickly determine objective values of patient’s visual acuity. We divided our sample into two groups. In first group was measured visual acuity with sVEP and Snellen method only on one patient twelve times. In the second group was measured visual acuity twice with sVEP and next time twice with Snellen method with Landolt rings and logMAR modification. We measured 32 non-pathological patients. Results show significant differences between average values of visual acuity gained with both methods (sVEP and Snellen) in both samples (T-test, p < 0,01, resp. Wilcoxonův test, p = 0,02 in second group). In the second group we showed significant correlations between repeated sVEP measurements (Spearman test, p < 0,05, r = 0,69) but no signifiant correlation between average sVEP measurement and average Snellen measurement (Spearman test, p > 0,05, r = 0,15). Objective measurement of visual acuity with sVEP is valid and repeatable method, but we recommend use it only in case, when is not possible to use subjective method for measuring of visual acuity, e.g. children, people with mental retardation or simulating/dissimulating people.

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