Zeiss has released updated cleaning guidance for its Humphrey Field Analyzer (HFA) perimetry devices, with a focus on air circulation and a list of key recommendations.
Due to the delicate surfaces of the perimeter’s bowl and optics, the ophthalmic device manufacturer has compiled detailed advice for eyecare professionals to protect the devices and ensure practices can maintain infection controls during COVID-19.
Do’s and Don’ts
- Zeiss advises that users keep the HFA powered on during bowl sanitising. Airflow through the bowl will help to circulate Isopropyl alcohol (IPA) mist within the bowl.
- Wipe all surfaces (except inside the bowl) with 70% IPA. Eyepatch, patient chinrest, headrest, patient response button, trial lens holder and trial lenses, Liquid Trial Lens, and all technician user interfaces should be cleaned.
- Inside the bowl, spray with 70% IPA using an automising-type sprayer. Before spraying, it’s important to retract the trial lens holder and cover with folded paper, while also covering the turret with paper. Allow the bowl to air dry for five to 10 minutes. Zeiss advises not to rub anything on to the bowl because it may damage the surface.
- The use of UV-C light to sanitise the bowl should be avoided because the exposure limits of HFA family optics have not yet been assessed.
- In terms of air circulation in the bowl, the air in the bowl exchanges several times during a typical test.
- The HFA is not required to be in a darkened or closed room. The eyecare professional can open the door to increase airflow the HFA test room. Some light will not affect the test accuracy (avoid direct light into the bowl), and the device will alert if room lighting is too bright.
- Patient monitoring features allow for ‘social/physical distance operation’. The HFA can be operated from external monitor with extended cables.
- The HFA offers shorter test times with SITA Faster, allowing the professional to clear patients from the room faster and allow more time between patients for cleaning procedures.
- Liquid lens an auto eye alignment with gaze initialisation helps minimise interaction with patient. This results in less chair time and allows for longer breaks between patients for cleaning procedures.
The latest HFA cleaning guidance – published on 1 May – can also be found here.
Zeiss has continued to update the ‘MED Support Now’ website with new tools, information and education programs to help practices adapt.
