Optotype-Frame Test
- Developed by Jonathan Holmes to detect central-peripheral rivalry-type diplopia
Test sequence
- Patient fixates on a isolated optotype on an illuminated monitor at 3 meters
- Use 20/40 sized optotype for those with VA 20/40 or better
- If VA worse than 20/40 use the smallest recognizable optotype for the worse eye
- The patient reports if the letter is single or double
- Then while fixating on the central letter, they report whether the frame of the monitor is single or double
Results
- No diplopia = patient sees a single letter and single frame
- Retinal misregistration = patient sees a double letter while seeing a single frame OR sees a single letter with a double frame
- Strabismic diplopia = patient sees a double letter and double frame
Figure 1 from reference 1 below