The Teller acuity card procedure. Three testers in a clinical setting

Area of Science:

• Ophthalmology
• Pediatric Optometry
• Clinical Research

Background:

• The Teller acuity card (TAC) procedure is a standard method for measuring grating acuity in young children.
• Variability in results can arise from factors such as the individual administering the test.
• Understanding tester influence is crucial for reliable clinical data.

Purpose of the Study:

• To investigate the impact of individual testers on acuity measurements using the TAC procedure in a clinical setting.
• To compare visual acuity results obtained by three experienced testers.
• To assess interobserver reliability in a busy pediatric ophthalmology practice.

Main Methods:

• Three experienced testers performed 971 TAC assessments on 570 pediatric patients.
• Patients ranged from 2 weeks to 17 years, with various ophthalmic diagnoses.
• Statistical analysis, including analysis of covariance, was used to compare results adjusted for age and diagnosis.

Main Results:

• Significant differences in right eye acuity scores were observed among the three testers (P = 0.02).
• Age was a significant predictor of acuity (P = 0.0001).
• No significant differences were found for left eye acuity scores among testers (P = 0.37).

Conclusions:

• The individual tester may influence visual acuity measurements obtained with the Teller acuity card procedure.
• Further research on interobserver reliability is recommended for the TAC procedure in clinical settings.
• Standardization of testing protocols may improve consistency of results.