They are called glasses .. And i have strabism and use them since like i was 4 years old They have low power lens (to be honest i don't know exactly the values) ...
You know there is an opinion that the structure of human eye is not so clear and well learned as it's said. I mean that our eyes can be cured by ourselves and we don't need any spectacles or glasses. We hold up the glasses making industry buying it.
I have bad eye vision cant even read the E on the chart without my glasses.. Going to get that lasic i surgery though kinda excited for that no more glasses.