20 Most Recent Zeiss Humphrey 740 Visual Field Analyzer Questions & Answers


Sounds like a heat, thermal issue. You may have a non- functioning cooling fan somewhere inside. There are several of them so don't be fooled if you hear one of them running. Same issue happens with CPUs on PC computers. Will suddenly shut off if too hot.

Zeiss Humphrey... | Answered on Apr 07, 2019


The trouble is with the CPU. It needs to be replaced

Zeiss Humphrey... | Answered on Sep 05, 2018


The two most common problems when trying to find a blind spot are: A.) Forgetting to patch the eye, and B.) Choosing the correct eye in the machine itself.

Zeiss Humphrey... | Answered on Jun 23, 2016


In the user manual they list some compatible printers that have a 25 pin parallel connector. We use Lexmark Optra E312L with good results. Once you hook it up, you have to go into one of the setup menus to port it over. The user guide tells the procedure.

Zeiss Humphrey... | Answered on Jul 27, 2015


I believe "state 19" is a weak main illumination bulb. Not sure if it's the same on your 740, but that's what the problem was with our 750i. Even though the bulb appears to be working, they dim over time and won't pass the start up calibration checks. On ours, there is a round access panel on top of the unit to service this bulb. Just be careful removing the bulb and don't bump any of the clear optical wheels. Part # 2660021106082 (for 750i. not sure about 740) Call Zeiss to confirm. Realize this is an old post so info is for future readers.

Zeiss Humphrey... | Answered on Jul 27, 2015


Yes it affect all tje instrument calibration when it is turn on, and when you have patient test the result is afected because the patien has light for the bavk and he is not able to see all the diferents type of lights

Zeiss Humphrey... | Answered on Oct 30, 2014


You sjould press the patient button and the same time turn it the instrument on keep in button press until you see in tje display the calibration message of the touchscreen

Zeiss Humphrey... | Answered on Oct 30, 2014


erro 99

Zeiss Humphrey... | Answered on Oct 01, 2014


is the cooling fan turning?

Zeiss Humphrey... | Answered on Oct 01, 2014


Did you move the brighness control. It is on the right side of the equipment. If not, it could be the video board inside of the equipment

Zeiss Humphrey... | Answered on Sep 10, 2014

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