Vision Panels

[contractman]

Morning

I am coming across various vision panels with different variances and ideally looking for clarification of some sort.

Is obscure GWPP or frosted glass acceptable for vision panel glazing, as common sense would suggest that vision should be possible through the glass?

Also I am seeing vision panel blinds being installed and although they look 'manufactured' I am unsure if these are compliant for the same reason as above

Thank you in advance