World Sight Foundation Field Machine (WSFFM) Pilot

Recruiting now · Not applicable

Conditions studied: Glaucoma

In brief

The current situation outside of large cities in lower-income countries, as described above, is suboptimal for the diagnosis of glaucoma. Doctors have no means of assessing visual fields, and as such may not be able to identify the condition until too advanced for any meaningful intervention (ie, to enable preservation of vision). Vision loss from glaucoma is irreversible. Understanding, through this pilot study, how well the World Sight Foundation Field Machine (WSFFM) works is an essential step towards trialling its use in lower-income countries. The justification for enabling this is to allow clinicians in the developing world to make more informed assessments of their glaucoma patient's status; this should translate in more timely treatments or referral for further investigation before further irreversible vision loss. The WSFFM will be compared to the Humphrey Visual Field (HVF) analyser. The HVF analyser is the gold standard method of measuring visual fields; in our hospital eye service it is almost exclusively the method used, and as such the field technicians are particularly skilled in their use. The output data of the HVF enables easy quantification of level of field loss; by comparing the output from the WSFFM it would be possible to allow some form of quantification against "the standard" such that an idea of how well it works may be calculated.

Key facts

Study ID: NCT07674069
Run by: Buckinghamshire Healthcare NHS Trust
People needed: 100
Starts: 2026-04-29
Expected to finish: 2026-07-01
Last updated by the study team: 2026-06-29

Who can join

Age: 18 and older, up to 99. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

- Patients attending glaucoma outpatient clinic
Patients requiring visual field testing, with plan for "SITA-STANDARD" HVF testing
Patients 18 years or older and of any gender
Patients capable of giving informed consent.

You may not qualify if…

- Patients not requiring visual field testing on that outpatient clinic attendance.
Patients requiring visual field testing, with plan for "SITA-FAST" or "SITA-FASTER" HVF testing.
Patients who do not attend their outpatient clinic appointment,
Patients not able to perform visual field testing (for example due to their visual acuity, physical difficulty in positioning for test duration, or cognitive difficulties in understanding instructions).
Patients under the age of 18 years old.

Where it is running

Buckinghamshire Healthcare NHS Trust — Aylesbury, United Kingdom (enrolling)

Full record on ClinicalTrials.gov

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