The BSE benchmark Sensex lost nearly 195 points in opening trade today, The 30-share index, which had lost 207.43 points in the previous session, fell further by 194.19 points, or 1.11 per cent, to 17,167.91 as soon as the trading session commenced this morning.In a similar fashion, the wide-based National Stock Exchange Nifty index declined by 62.65 points, or 1.19 per cent, to 5,158.40 within minutes of the opening bell.