Here is a link that is the most thorough I know of on the topic.
http://www.emedicine.com/OPH/topic245.htm
Basically, it can affect the retina. Your son is really not considered to be at a very high risk from this though because he is young, has not been on Plaquenil long (usually minimum of 5 years before this is seen), is likely on a dose of less than 6.5mg/kg/day (or weighs more than 130 pounds and has 400mg per day or less of Plaquenil) and probably has healthy kidneys. It can happen of course but most doctors believe the true incidence of retinal toxicity caused by Plaquenil to be less than 1%.
I know when I was 15, I had a severe change in my eyes and it was just due to whatever makes so many of us nearsighted! I hope that's all it is in your son's case. Please let us know how it turns out after your son has seen the specialist.
http://www.emedicine.com/OPH/topic245.htm
Basically, it can affect the retina. Your son is really not considered to be at a very high risk from this though because he is young, has not been on Plaquenil long (usually minimum of 5 years before this is seen), is likely on a dose of less than 6.5mg/kg/day (or weighs more than 130 pounds and has 400mg per day or less of Plaquenil) and probably has healthy kidneys. It can happen of course but most doctors believe the true incidence of retinal toxicity caused by Plaquenil to be less than 1%.
I know when I was 15, I had a severe change in my eyes and it was just due to whatever makes so many of us nearsighted! I hope that's all it is in your son's case. Please let us know how it turns out after your son has seen the specialist.