Suggest Proper Treatment For Meridian Amblyopia In A 5 Year Old

My son is 5 years and 3 months old. He has just been diagnosed with meridian amblyopia OD +2.5 -3.75x170 OS +1.75 -2.5x015 My ophthalmologist prescribe glasses and ask to wear it for 6-8 weeks than go back for check up. She said if his vision doesn t improve, she will prescribe patching. I am wondering if this is too little too late? I saw an article on Internet that it is only effective before 5 years old and after this age, it is difficult to treat once their brain develop. Is this true? Also, I saw from this site that there is a similar case 2 years ago but milder condition than my son. Her doctor suggest patching for 6 hrs a day and with light therapy. Did her son recover well?