Projects per year
Design: Randomised balanced incomplete block trial. Optometrists and ophthalmologists in the Hospital Eye Service classified lesions from vignettes comprising clinical information, colour fundus photographs and optical coherence tomography images. Participants’ classifications were validated against experts’ classifications (reference standard).
Setting: Internet-based application.
Participants: Ophthalmologists with experience in the age-related macular degeneration service; fully qualified optometrists not participating in nAMD shared care.
Interventions: The trial emulated a conventional trial comparing optometrists’ and ophthalmologists’ decision-making, but vignettes, not patients, were assessed. Therefore, there were no interventions and the trial was virtual. Participants received training before assessing vignettes.
Main outcome measures: Primary outcome - correct classification of the activity status of a lesion based on a vignette, compared with a reference standard. Secondary outcomes - potentially sight-threatening errors; judgements about specific lesion components; participants’ confidence in their decisions.
Results: In total, 155 participants registered for the trial; 96 (48 in each group) completed all assessments and formed the analysis population. Optometrists and ophthalmologists achieved 1702/2016 (84.4%) and 1722/2016 (85.4%) correct classifications, respectively [odds ratio (OR) 0.91, 95% confidence interval (CI) 0.66–1.25; p=0.543]. Optometrists’ decision-making was non-inferior to ophthalmologists’ with respect to the pre-specified limit of 10% absolute difference (0.298 on the odds scale). Optometrists and ophthalmologists made similar numbers of sight-threatening errors [57/994 (5.7%) versus 62/994 (6.2%), OR 0.93, 95% CI 0.55–1.57; p=0.789]. Ophthalmologists assessed lesion components as present less often than optometrists and were more confident about their classifications than optometrists.
Conclusions: Optometrists’ ability to make nAMD retreatment decisions from vignettes is not inferior to ophthalmologists’ ability. Shared care with optometrists monitoring quiescent nAMD lesions has the potential to reduce workload in hospitals.
- BTC (Bristol Trials Centre)
- Centre for Surgical Research