The 15-year-old was then struck in the eye and left in agony, his mum, Michelle, told Metro.co.uk.
Following the incident, the teenager was forced to undergo a three hour operation in a bid to save his eye.
However doctors later revealed that the pen had severely damaged the retina – meaning Haydn would never regain his sight in his left eye.
Speaking to Metro.co.uk, Michelle said: ‘Haydn was repeatedly bullied by a group of boys and in April a child stabbed him in the eye with a pen.
‘His eye was bleeding from inside and he couldn’t open it. The whole of his eye was black.
‘He won’t leave the house and has panic attacks. Little things we take for granted like crossing the road have become a lot harder.
‘At first we didn’t realise Haydn had gone blind.
‘We were travelling from Kent to London to visit the hospital twice a week.
‘Then after three weeks we were told there was nothing they could do. A CT scan revealed the pen had gone through the eye and damaged the retina.
Since the incident Haydn has not returned to school and a police investigation has been launched.
Due to missing school since April, the 15-year-old will also be made to repeat Year 10.
Michelle claims that she has ‘not heard once’ from head teacher Carl Roberts, however ‘other staff have been amazing’.
She said: ‘The headmaster has not contacted me once to see how Haydn is.
‘Other members of the school have been brilliant, but the senior staff have not called once.
‘We have spent the last three months focusing on helping Haydn.
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