Thanks to Brian Spencer, Dr. David Kelly's Last Interview , I've spent an interesting time watching what is billed as "Dr. Kelly's Last Interview".
Only a small proportion of the video is actual video footage of David Kelly being interviewed. Nonetheless I found watching the video very interesting in terms of adding to my feel for the personality and mind of the man.
Like Brian, I noticed that for much of the interview David Kelly wasn't wearing glasses.
Those familiar with the report of Dr. Nicholas Hunt will recall that he interpreted Dr. Kelly not wearing his glasses when found dead as evidence of suicide.
As the video shows, sometimes Dr. Kelly wore his bifocal glasses and sometimes he didn't. It's as simple as that.