Results of the eye test UFC middleweight contender Michael Bisping underwent in London late last week came back "inconclusive," according to Bisping's manager Audie Attar, via a report from Ariel Helwani on UFC Tonight.

Bisping pulled out of a scheduled bout against Mark Munoz in September 2013 after suffering a detached retina -- an injury which Bisping initially suffered at UFC 159 and eventually left him nearly blind in his right eye.

Bisping subsequently developed a cataract in the same eye, which led UFC officials to request further testing to gauge Bisping's depth perception and peripheral vision before allowing him to return to competition.

According to Attar, physicians in London were unable to secure the correct equipment to properly test Bisping's eye, and Bisping is now expected to re-undergo testing on his right eye at a date yet to be decided.

As if this writing, Attar is unsure what effect the ambiguous result of Bisping's test will have on the Brit's planned grudge match against Tim Kennedy, which is intended to headline April 16's TUF Nations finale in Quebec, Canada.

Kennedy is 2-0 under the UFC banner and has publicly prodded Bisping for much of the last three months following the American's first-round knockout of Rafael Natal.

Bisping holds a 14-5 record since debuting inside the Octagon in 2006. He most recently bounced back from a failed No. 1 contender bid against Vitor Belfort to pick up a unanimous decision win over Alan Belcher.