He has been supporting the Big 180 campaign organised by Paddy Power, which aims to encourage 180,000 men to assess if they are at risk.
NHS guidance states the chances of developing prostate cancer increase as you get older and most cases develop in men aged over 50.
Men whose father or brother were affected by prostate cancer are at slightly increased risk themselves.
Prostate Cancer UK chief executive Laura Kerby said she was “thrilled” at how successful the campaign had been so far.
She said: “We’re also proud that this life-changing campaign has reached the very top of the PDC and thank Barry Hearn for being so open about his health issues.
“It’s incredible to see more than 85,000 people have now completed our simple online risk checker since the start of this year’s campaign… there’s little doubt that we are making a huge impact via the darts community.”