“Review of Ophthalmology” Magazine article in the “What’s New” section about the FaceDownWalker®:
http://www.reviewofophthalmology.com/article/visiometrics-updates-hd-analyzer
https://surgicaltechedu.org/vitrectomy/
http://www.asrs.org/patients/retinal-diseases/25/vitrectomy
https://nei.nih.gov/health/macularhole/macularhole
http://www.allaboutvision.com/conditions/vitreoretinal-procedures.htm#top
EyeSmart: eye health information from the American Academy of Ophthalmology
American Society of Retina Specialists Retinal Diseases/Health Series
https://my.clevelandclinic.org/health/transcripts/1623_ask-a-retina-specialist