Editing Diabetic retinopathy (section)

=== Light treatment ===
A medical device comprising a mask that delivers green light through the eyelids while a person sleeps was under development in 2016.<ref name=Sivaprasad2016>{{cite journal | vauthors = Sivaprasad S, Arden G | title = Spare the rods and spoil the retina: revisited | journal = Eye | volume = 30 | issue = 2 | pages = 189–192 | date = February 2016 | pmid = 26656085 | pmc = 4763134 | doi = 10.1038/eye.2015.254 }}</ref><ref>{{Cite web|title=Noctura 400 Sleep Mask for diabetic retinopathy|url=https://www.io.nihr.ac.uk/report/noctura-400-sleep-mask-for-diabetic-retinopathy/|access-date=2022-02-15|website=NIHR Innovation Observatory}}</ref> The light from the mask stops [[rod cells]] in the retina from [[Adaptation (eye)#Dark adaptation|dark adapting]], which is thought to reduce their oxygen requirement, which in turn diminishes new blood vessel formation and thus prevents diabetic retinopathy.<ref name=Sivaprasad2016/>  As of 2016 a large clinical trial was underway.<ref name=Sivaprasad2016/> As of 2018, the results from the clinical trial showed no long-term therapeutic benefit from using the mask in diabetic retinopathy patients.<ref>{{Cite web| vauthors = Powell S |title=No "long-term therapeutic benefit" from £250 mask|url=https://www.aop.org.uk/ot/science-and-vision/research/2018/03/16/no-long-term-therapeutic-benefit-from-250-mask|access-date=2022-02-15|website=www.aop.org.uk|language=en}}</ref>