Noctura 400 is a home-use sleep mask designed to provide nightly treatment for adults with diabetic eye disease. Worn while sleeping, the soft, wearable mask delivers low-level green light through the eyelids. The brand says this approach reduces oxygen demand in the retina, which is particularly affected by diabetes, and is intended to treat diabetic retinopathy, macular oedema and maculopathy. The non-invasive treatment is designed to be easy to use and can be used alongside existing care, including NHS treatments such as injections or laser therapy, with users advised to follow their specialist’s guidance.

Noctura 400 is presented as a clinically evaluated, CE-marked Class IIa medical device, with the site citing NHS evaluation results and patient use. Each mask provides 12 weeks of nightly treatment. Customers can purchase a mask outright or subscribe to receive a replacement every 12 weeks; both options include free UK delivery and a 30-day money-back guarantee on the first mask.