One criticism of increased screening for retinal toxicity in routine practice is consultants saying that they see only a handful of cases during their career, Dr. Yates observed. However, if you consider that in an average rheumatology department there are five consultants and 900 patients on hydroxychloroquine, 500 patients take the drug for 5 years or longer, 2% are picked up with non-OCT screening, that amounts to around two cases per year over a 5- to 10-year period. “So that fits with the narrative of only having seen a handful of cases pre-OCT,” Dr. Yates reasoned.
“I believe that this is a real problem, but I’m afraid this is the tip of the iceberg,” commented Caroline Gordon, MD, after her presentation. “We’ve been screening our patients in Birmingham now for about 5 years and we are definitely finding a significant number of patients with hydroxychloroquine toxicity who can be picked up with OCT and visual fields screening.”
Dr. Gordon, professor of rheumatology at the University of Birmingham (England) and a consultant rheumatologist for the University Hospitals NHS Foundation Trust and the Sandwell & West Birmingham Hospitals NHS Trust, helps look after one of the largest cohorts of patients with SLE in the United Kingdom.
A baseline eye examination has always been recommended, Dr. Gordon said, but she suggested that this could remain in the realm of the opticians with further assessment and referral as needed.