Abstract

SO.13.04

Automated kinetic perimetry in children

Bettina Wabbels1, Stephanie Wilscher2
1Universitäts-Augenklinik Bonn; 2Regensburg

Objective
Visual field testing in children is often performed using a Goldmann perimeter. Because the technique is performed manually, it is difficult to standardize and most examiners use too high test velocities. Automated kinetic perimetry was successfully established in adults, but to date no results in children have been published. We now tested feasibility and outcome of automated kinetic perimetry in children in a standard clinical setting.
Methods
Fifty children aged 5-14 years were examined at the Twinfield-perimeter, including healthy children, children with unilateral pathologies (normal eye tested) and children with strabismus. Kinetic perimetry was performed using stimuli III4, I4, I2 and I1 (Goldmann standard) with a test velocity of 2°/s. Whenever possible, each test was performed twice. Automated or manual re-testing was possible on the same device whenever indicated.
Results
All children but one 11 year old were able to perform the test at least once. There was no significant influence of age on the isopters or the area inside the isopters. No significant difference was found between the children with strabismus and the other children. Automated kinetic perimetry took about 3,5 min per eye and was even shorter than manual Goldmann-perimetry (despite the constant lower test velocity).
Conclusions
Automated kinetic perimetry is possible in many children in a clinical setting using a commercially available Twinfield-perimeter in a session of clinically practical duration. Advantages are a constant test velocity which is not dependant on the examiner. Test performance was not only dependent on age, but also on the child’s maturity and ability to concentrate. Manual or automated re-testing is possible and recommended in cases of unexpected results.

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