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Viagra could harm your vision, a study claimed today.

Canadian experts found regularly taking the common erectile dysfunction pill may raise the risk of three serious eye conditions.

Three other impotence medicines — Cialis, Levitra and Spedra — were also named as being potential triggers of eye problems.

They found the medications may cause sudden losses of vision, flashes of light and dark spots or 'floaters' in those who take them. 

Increasing blood flow to the genitals with the pills could be hindering its supply to the eyes, which the experts suggested may be to blame.

Lead researcher Dr Mahyar Etminan, an ophthalmologist at the University of British Columbia, said people using the drugs who develop vision problems should 'seek medical attention'.

Dr Etminan said: 레비트라구매사이트 'These are rare conditions, and the risk of developing one remains very low for any individual user. 

'However, the sheer number of prescriptions dispensed each month in the US —about 20million — means that a significant number of people could be impacted.

'Regular users who find any changes in their vision should take it seriously and seek medical attention.' 

Viagra could increase the risk of developing three serious rare eye conditions by up to 85 per cent

More than 2.9million men were prescribed Viagra on the NHS in 2016, the latest date data is available for.
But the pills are also available over the counter.

The study, published in JAMA Ophthalmology, analysed insurance claim records of 213,033 men using ED pills.

It did not specify what the men — who were mostly in their sixties — were taking the drugs for.

However, sildenafil — the main ingredient in Pfizer's Viagra — can also be used to  treat pulmonary hypertension.