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[Static fundus perimetry in normals. Microperimeter 1 versus SLO]
C Springer1, H E Völcker, K Rohrschneider
1Augenklinik, Universität Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg. Christina_Springer@med.uni-heidelberg.de
Summary
The Microperimeter 1 (MP-1) shows higher light sensitivity thresholds than the scanning laser ophthalmoscope (SLO) in normal eyes. A correction factor of about 2 dB is recommended when comparing results from these two fundus perimetry devices.
Area of Science:
- Ophthalmology
- Visual Science
- Medical Devices
Background:
- The Microperimeter 1 (MP-1) enables fundus-controlled static perimetry of the central visual field.
- Scanning laser ophthalmoscope (SLO) fundus perimetry is an established method for visual field analysis.
Purpose of the Study:
- To compare the Microperimeter 1 (MP-1) with the scanning laser ophthalmoscope (SLO) for fundus perimetry.
- To evaluate light increment sensitivity threshold values in normal subjects using both devices.
Main Methods:
- Fundus-controlled static threshold perimetry was performed on 31 eyes of healthy volunteers.
- The MP-1 and SLO devices were used to test the central 21x12 degree visual field at 40 stimulus locations.
- Light increment sensitivity threshold values were compared between the two perimeters.
Main Results:
- Average light increment sensitivity was 19.1±0.5 dB with the MP-1 and 17.2±0.9 dB with the SLO.
- Threshold values were, on average, 1.9±1.3 dB higher when measured with the MP-1 compared to the SLO.
- Both devices demonstrated reproducible functional analysis of the central retina.
Conclusions:
- Both MP-1 and SLO provide reproducible functional analysis of the central retina with fundus control.
- A correction factor of approximately 2 dB is suggested for comparing MP-1 and SLO perimetry results.
- This finding aids in the accurate interpretation of visual field data across different perimetry systems.