|Amazon cat eyes|
|Vintage Edna Everage. Source|
Interestingly, when the cat eye style went out of vogue by the end of 60s, in the 70s and 80s there was a deliberate backlash against them, as spectacle styles changed shape entirely and got extra big and bug-eyed. However, more recently the distance of age has given them a retro cachet and there's been something of a cat eye revival. Well they are fabulous.
|1958 cats eye green glasses. Source|