iCare ST500 is the world’s first slit-lamp-mounted rebound tonometer, representing a leap forward in intraocular pressure (IOP) measurement. Designed with eye care professionals and patients in mind, it delivers fast, accurate, and repeatable readings without topical anesthesia, fluorescent dye, or disinfecting between patients. With its calibration-free technology and intuitive user interface, this iCare tonometer streamlines daily workflows while enhancing patient comfort.
According to Global Product Manager Sami Pakarinen, the iCare ST500 slit lamp tonometer was developed to meet rising expectations in clinical efficiency and patient experience. “Market trends indicated a demand for devices that could integrate seamlessly into existing workflows while providing reliable and repeatable results,” he explains.
“At the same time, we continued our approach of enabling a streamlined process that doesn’t require steps like calibration or the use of anesthetics, which are still necessary with traditional methods like GAT,” Pakarinen adds.
Motivation rooted in clinical needs – Why iCare ST500 was developed
The key motivation behind the development of the iCare ST500 tonometer was to combine the well-known benefits of iCare rebound tonometry with slit lamp integration. Goldmann Applanation Tonometry (GAT) has traditionally been considered the gold standard in IOP measurement. However, GAT requires more time, trained personnel, and patient cooperation—and involves fluorescent dye, topical anesthesia, and disinfection routines.
“The iCare ST500 tonometer provides a simpler and more efficient alternative,” Pakarinen notes. “It enables accurate measurements even in challenging cases, saving time and improving the overall experience for both the professional and the patient.”
A slit lamp tonometer co-creation process with eye care professionals
From the start, the development of the iCare ST500 tonometer was closely tied to end-user input. Eye care professionals participated in early interviews and feedback sessions, helping the team understand what truly matters in clinical settings. “Ease of use, reliability, and patient comfort were emphasized time and again,” Pakarinen says.
The feedback shaped key design features, including the intuitive user interface and Quick Measure mode. The device was also tested in clinical environments throughout the project to ensure safety and functionality. “Over 15 professionals were involved in the initial interview phase alone,” Pakarinen adds.
One of the main development challenges was ensuring compatibility with a wide range of slit lamp models. “There are many different slit lamps in use globally,” says Pakarinen. “We wanted a solution that could integrate with most of them.” This led to the creation of an adapter that fits the standard 8 mm calibration rod opening present in most slit lamps. Extensive testing confirmed broad compatibility; the iCare ST500 tonometer works with most devices available today.
Quick Measure mode – A smart feature for faster and easier IOP readings
The Quick Measure feature, initially introduced with the iCare IC200 tonometer, was developed to address real-life challenges—such as patients who blink, move, or feel anxious during exams. “Thanks to Quick Measure mode, the iCare ST500 tonometer also makes do with only two or three consecutive measurements instead of six,” Pakarinen explains.
“This enables faster readings, especially when dealing with patients who struggle to stay still.” By reducing the number of measurements, Quick Measure not only improves efficiency but also helps reduce patient stress. “The procedure is often over before the patient even realizes it,” he adds.
Proven impact of a slit lamp rebound tonometer on clinical use
It’s no wonder the early adopters have highlighted the speed and ease of use of the iCare ST500 slit lamp tonometer. “One ophthalmologist even told us they could leave work earlier because of how much the iCare ST500 tonometer sped up the patient flow,” Pakarinen shares. “That kind of feedback speaks volumes about the device’s practical value.”
Compared to GAT, the iCare ST500 tonometer represents a method that is not only faster but also perceived as more comfortable by patients. Single-use probes and the absence of fluorescent dye or anesthetics make the examination process smoother and more hygienic.
Looking to the future of rebound tonometry
Rebound tonometry is expected to play an increasingly important role in eye care. “Its ease of use, accuracy, and patient-friendly nature make it a compelling choice,” Pakarinen says. “As integration and connectivity evolve, rebound tonometers like iCare ST500 will become increasingly essential in clinical workflows.”
With its combination of user-focused design and technological innovation, the iCare ST500 tonometer is poised to set a new standard in slit lamp tonometry, redefining what eye care professionals can expect from IOP measurement tools.
Learn more about the iCare ST500 slit lamp tonometer – features, specs, and clinical benefits.
