February 2016 โ Because of reports of serious eye problems, specifically retinal necrosis, following the Zostavax vaccine, Merck & Co. was required to change the warning to include retinal necrosis.
Reference
Reference:ย Center for Biologics Evaluation and Research. โApproved Products โ Zostavax.โ Internet Archive Wayback Machine, Center for Biologics Evaluation and Research, wayback.archive-it.org/7993/20170722150959/https:/www.fda.gov/BiologicsBloodvaccines/Vaccines/ApprovedProducts/ucm136941.htm.