Radboudumc research shows that patients who suddenly develop eye floaters, particularly in large numbers, may need urgent assessment by an ophthalmologist.
New eye floaters are often considered harmless, but they may also be an early warning sign of retinal detachment. A study led by Radboudumc found that patients who visit their general practitioner with floaters have a higher risk of retinal detachment than patients reporting flashes of light alone. The findings have been published in The Annals of Family Medicine.
Floaters are small dots, strands, or shapes that appear to move across a person’s field of vision. They are common and are usually caused by normal changes inside the eye. In some cases, however, they may occur when the retina tears or begins to detach from the back of the eye. Without rapid treatment, retinal detachment can lead to permanent vision loss.
Greater risk with sudden or numerous floaters
The researchers analyzed more than 1,100 episodes in which patients visited a Dutch general practice because of floaters, flashes, or both. Patients reporting floaters had a higher risk of retinal detachment than those who experienced flashes alone.
The risk was particularly elevated when the floaters had appeared recently or when patients described seeing many of them. These characteristics may therefore help general practitioners identify which patients require urgent ophthalmological evaluation.
Current primary care guidelines mainly emphasize flashes of light and loss of vision as alarm symptoms. Floaters often receive less attention. The findings suggest that new-onset floaters should also be taken seriously, especially when they are sudden or numerous.
Studying symptoms before a diagnosis is known
The study used data from FaMe-Net, the Family Medicine Network. This Dutch research network collects detailed, long-term information from general practices, including patients’ reasons for seeking care, diagnoses, treatment, and referrals.
This makes it possible to study how illnesses first present in everyday primary care. Patients usually visit their general practitioner with symptoms rather than an established diagnosis, providing researchers with insight into the earliest stages of disease recognition.
According to the researchers, this is the first study to quantify the risk of retinal detachment associated with floaters in a primary care population. Previous research has often focused on patients who had already been referred to specialist eye care.
Supporting earlier referral
“For general practitioners, the challenge is to recognize which patients need urgent referral. Our findings can help make that assessment more precise,” says Floris van de Laar, GP and researcher at Radboudumc and Radboud University. "Earlier recognition and treatment of retinal detachment may help prevent permanent vision loss."
Because the study was retrospective and based on routinely recorded care data, further research is needed to determine how the findings can best be incorporated into referral guidelines and clinical practice.
About the publication
Van Zon B, Spoelder M, Peters HJ, et al. (2026). Do Vitreous Floaters Predict Retinal Detachment? Retrospective Cohort Study in Primary Care. DOI: 10.1370/afm.240149.
