1
My dog is blind.
Sign "my", then "dog", and finish with the sign for "blind". Make sure to use a clear bent "V" handshape pointing toward your eyes to clearly convey the meaning.
2
He is legally blind.
Sign "he", "legal" (using the "L" handshape against your non-dominant palm), and then "blind". Keep your facial expression neutral and informative to match the context of the sentence.
3
The bright light made me blind.
Sign "light", "bright", "make", "me", and then "blind". You can squint your eyes or turn your head slightly while signing "blind" to emphasize the temporary loss of vision from the glare.