Question:
Based on the premise "for some reason my eyes aren't quite what they used to be either", can we conclude that "I used to have 20/20 vision in each eye. "?
****
Answer:
it is not possible to tell

Question:
Based on the premise "The silence continues for 30 seconds till she walks around the corner and disappears into a closed back corridor, followed by her legal team.", can we conclude that "The silence continued for 30 seconds."?
****
Answer:
yes

Question:
Based on the premise "After all, the Japanese themselves are constantly analyzing their own nature.", can we conclude that "Analyzing their nature as a people is considered taboo in Japan."?
****
Answer:
no