New-onset vitreous floaters may represent a stronger warning sign of retinal detachment than flashes in primary care, according to a retrospective cohort study published in Annals of Family Medicine.
Researchers at Radboud University Medical Center in Nijmegen, The Netherlands, analyzed 1,181 episodes of patients aged 18 years or older presenting with floaters, flashes, or both across seven family practices between 2012 and 2021. The study aimed to quantify the absolute and relative risks of retinal detachment in a primary care setting, where early identification is critical to preventing vision loss.
Retinal detachment—defined in this study to include retinal tears—occurred in 6% of episodes involving floaters alone, compared with 5% of those involving flashes alone. Patients presenting with both floaters and flashes had the highest risk, at 8%.
Although floaters were associated with a higher absolute risk than flashes, differences between the main symptom groups were not statistically significant after adjustment for age and sex.
Risk was higher in specific subgroups. Statistically significant increases were observed in patients reporting many floaters (10 or more or described as a “cloud,” “haze,” or “curtain”) and in those presenting with both floaters and flashes, particularly when symptoms were acute (14 days or less). Patients with many floaters had more than a fourfold increased risk compared with those presenting with flashes alone.
Floaters and flashes were relatively common presentations, with incidence rates of 5.5 and 2.7 per 1,000 patient-years, respectively. Overall, retinal detachment developed in 6% of episodes involving these symptoms.
Not all retinal detachment cases presented with floaters or flashes; the authors identified additional episodes that began with other symptoms or were detected in other care contexts. Common alternative diagnoses included posterior vitreous detachment and migraine.
Current Dutch primary care guidelines emphasize flashes and visual field loss as key warning signs requiring urgent referral to an ophthalmologist, with less emphasis on floaters. These findings suggest that floaters—particularly when acute or numerous—may warrant greater attention as an alarm symptom.
The authors recommend considering urgent ophthalmology referral for patients presenting with recent-onset or multiple floaters to confirm or exclude retinal detachment, while recognizing that many cases have benign causes and warrant appropriate safety-net advice.
Overall, the study supports a more evidence-based approach to evaluating visual symptoms in primary care, with floaters playing a more prominent role in risk assessment.
The study authors reported no conflicts of interest.
Source: Annals of Family Medicine
