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The 28-year-old started Saturday's 2-2 drew with Manchester City wearing his specially-fitted spectacles but quickly discarded them.
The Cameroon international suffers from an eye problem and dons the eyewear to prevent an infection, but it is not an ideal situation as the glasses can be restrictive.
"I have an eye problem so I have to wear the glasses," he told the Times.
"The doctor said if I caught an infection it would be very bad. It's not good when I'm playing without the protection.
Song's condition means he struggles to see in the dark or rain while his vision also fails him when he wears the glasses under a stadium's floodlights.
"Sometimes I have to play without them because I can't see properly but it's a risk.
"I have to be careful because it's not good for the future. I have to keep wearing them until the doctor tells me not to.
Illustrated: Every Premier League No10
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"Today [against Manchester City] was a very hard start to the game and then I took them off because I couldn't see properly."
Sergio Aguero's late strike salvaged a point for City at Upton Park but Slaven Bilic's side are still well placed in sixth, just six points shy of the top four.
Song's campaign has been disrupted by injury but he is determined to retain full fitness and help the Hammers during the second half of the season.
"If I'm 100 per cent, I know what I can do. I know I can fly," he added.