Since he was born, Daniel Fiddes has suffered from nystagmus, a condition often known as “wobbly eyes”.
It means his eyes move rapidly and uncontrollably, leaving his vision permanently impaired.
His condition affects depth perception and focus, making tasks such as reading difficult. Sports involving balls, which need perception of speed and distance, are also a problem.
But when Daniel discovered judo at the age of seven, everything changed.
The 13-year-old, from Hamilton, recently won bronze in a national judo competition for the visually impaired.
Nystagmus is a sight loss condition that affects 2.4 people per thousand in the UK, according to the Royal College of Ophthalmologists.
Daniel has infantile nystagmus, which develops around three to four months after birth.
Many people with the condition do not describe their vision as blurry but instead complain of strain and difficulty seeing.
In nystagmus, the eyes will be focusing on something and then start to drift away before quickly snapping back.
This eye movement happens very fast, between two to four times a second.
Nystagmus affects different areas of the eye in different people.
For some, the eye movement is worse when looking straight ahead compared to looking side-on.
In the worst positions for the eyes, sufferers feel more strain and tiredness.
Source: BBC
