A MYSTERIOUS bug contracted on the Kokoda Track has nearly claimed the eyesight of NSW Liberal MP, Charlie Lynn.

Mr Lynn is a veteran of the track and when Parliament is not sitting he leads expeditions along the route.

He had to be evacuated from his 59th trek after a parasite lodged under his contact lenses.

He says the parasite may have lodged on his eye when he cooled down in a river at a campsite.

"The second possibility is that of course I use a sweat rag and I'm dipping that in water all the time and wiping my forehead and my eyes," he said.

Mr Lynn went blind in both eyes, but after three weeks treatment in Sydney he has regained some vision in his left eye.

"I should be a lot more compassionate in my leanings, because I can only see out of my left eye now," he said.

He says his eyes are responding to the treatment and the incident has not put him off returning to PNG.

Spotter: Don Hook