الفهرس 
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Abstract
Our study showed no significant changes between AstraZeneca, Johnson and Sinovac covid 19 vaccines for OCT parameters except decrease in choroidal thickness in Sinovac group one month after 2nd dose of vaccination and increased of FAZ area in Johnson>Sinovac> AstraZeneca.
More changes and reduction in Superficial, deep and choroidal vessels density occur with Johnson group than with Sinovac and AstraZeneca groups.
Optic disc density shows more reduction in Sinovac as compared to Johnson and AstraZeneca groups between pre and post vaccines.