The boy seriously injured in a blast at a British Territorial Army barracks has been blinded.
Stephen Menary, 14, from the White City estate, west London, may also lose hearing in his left ear.
Stephen, a cadet at the TA Centre in Shepherd's Bush, west London, has already lost his left hand because the explosion.
A spokeswoman for the Chelsea and Westminster Hospital said Stephen lost his right eye to cancer when he was four months old and has now lost sight in his left eye.
A statement by his parents Steve and Carol said: "We appreciate everyone's concern over Stephen and the many messages of support we have received.
"Our main concern is that our family is given the space and time to care for Stephen who faces a difficult journey ahead as he starts to recover from his appalling injuries."
He is being kept on a ventilator in the hospital's intensive care unit. He also has chest injuries.
He has had two operations since he was admitted and faces more.
Scotland Yard are waiting for Stephen to recover to establish how he came by the bomb. Security sources say it is very unlikely the bomb was made by terrorists.
No-one else was injured in the blast.