Jannelli and Halberg Trial Lens Clips are in effect, trial frames that may be fitted over a patient's spectacles. Excellent for checking presbyopic addition when the patient's distance is known to be correct. Check prism in any position and power; to accept plus or minus lenses during retinoscopy or muscle balance tests. Check range of refracting using a child's existing frame.
The OS-398 Halberg Clip Design accepts two pair of trial lenses, and is the smaller, ligher-weight clip. The OS-399 Jannelli Clip design accepts three pair of trial lenses and features a built-in bubble level to ensure proper horizontal alignment.
Both Halberg and Jannelli are supplied two trial clips per box.