[Optimizing the automatic self-tonometer by an acoustic control signal and changed fixation optics].
An automatic self-tonometer must fulfill special requirements from the point of view of precision as well as user-friendliness. The sensor that applanates the cornea must be perfectly centered on the vertex in order to measure the intraocular pressure correctly. The modified version of the self-tonometer has been equipped with an acoustic control signal and a modified fixation lamp that facilitate its use. In order to analyze the effectiveness of these hardware changes, we compared the modified tonometer to the existing self-tonometer in a randomized study with 30 patients. Reference was the Draeger hand-held applanation tonometer. The results show comparable precision; however, the percentage of error measurements in the modified tonometer was considerably lower. This is a definite improvement in the development of the self-tonometer.
Draeger
J
J
Universitäts-Augenklinik Hamburg.
Groenhoff
S
S
Hock
B
B
Klemm
M
M
D000293:Adolescent; D000328:Adult; D000368:Aged; D002138:Calibration; D004867:Equipment Design; D005260:Female; D005403:Fixation, Ocular / Q000187:drug effects; D005901:Glaucoma / Q000175:diagnosis* / Q000188:drug therapy; D006801:Humans; D007429:Intraocular Pressure / Q000187:drug effects; D008297:Male; D008838:Microcomputers; D008875:Middle Aged; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D014065:Tonometry, Ocular / Q000295:instrumentation*