i have had this mask for over 5 years and can say it has improved my eyesight and helped control my diabetes . i can recommend it to anyone who has problems with diabetes and fluid at the back of their eyes as it helped me with mine. i was finding i couldnt see clearly at night when i was driving, but after wearing the mask for a few months my eyesight improved greatly. Also during lockdown i wasnt able to see anyone to get a diabetes check up but found the mask helped my situation, big thanks to Alison for all her help over the years.