The Zimbabwean intractable leader, who was whisked away during the week to Singapore, after suffering near-coma, is reportedly undergoing advanced treatment in a medical facility in Singapore for complicated eye problems caused by old age that can make it look as if he has dozed off in public, his spokesman told a state-owned newspaper.

The 93-year-old- Mugabe is often caught on camera appearing to be dozing at public events, and his health in general is a hot topic before next year’s presidential election, which he is expected to contest. He left for Singapore on Monday, his second medical trip in about two months .

The pictures and videos of Mugabe apparently nodding off have gone viral on social media and opponents have mocked him as unfit for office.

But Mugabe’s spokesman, George Charamba, blamed the president’s eyes, and told the newspaper the Herald that local opticians suggested he should seek treatment abroad.