The case comes just days after the first anniversary of the anti-government rallies, which were again marked by rioting and vandalism last Saturday.
It is the first case arising from 212 cases of alleged police brutality being investigated by the IGPN police oversight body.
Demonstrators accuse police of using excessive force to suppress the movement, in particular the use of rubber bullets which activists say have caused some two dozen people to lose an eye.
More than 4,000 people – protesters and police officers – have been injured during a year of protests. Photo: AFP
Around 2,500 demonstrators and 1,800 security force members have been injured since the protests began, according to an official count.
On Saturday, another demonstrator lost an eye after being hit in the face, apparently by a police tear gas canister. A video showed him standing in a group talking when he was struck.
The 44-year-old officer on trial on Thursday was also caught on camera in the act of throwing the stone during the May 1st protests, when ‘yellow vests’ demonstrated alongside the traditional union rallies. The video did not show where the stone landed or if anyone was hit.
He risks up to three years in prison and a fine of €45,000 if convicted of “deliberate violence by a person in a position of public authority”.
The SGP police union has accused the judiciary of trying to make a “scapegoat” of him and argued that he had acted in self-defence.
His lawyer Laurent Boguet told the court that May 1st was a “very violent day” on which police had come under attack from stone-throwing protesters.
Among those hit was the accused’s commanding officer, who was struck in the face by a paving stone and badly injured.
Eyes and limbs lost
The fierce violence that flared during the protests last winter made headlines worldwide, with rioters running amok in Paris and other cities, smashing shopfronts, torching cars and looting businesses.
Yellow vest protests in rural France have been relatively peaceful, by contrast.
The riot police officer on trial in Paris is from a unit based in the southwestern city of Toulouse that was sent to the capital as backup.
His lawyer moved to have the charges dropped, noting that no plaintiff had come forward in the case.
Another officer is set to stand trial in the coming weeks for slapping a protester in the face during the same May 1st protest in Paris, a scene also caught on video.
Activists say that in addition to those blinded, five ‘yellow vest’ protesters have lost a hand to police stun grenades, and one a testicle, while dozens of others have sustained other injuries.