oral medication for kid?

Dear all,

I want to know is there any oral medication available for a child which can be well tolerated by kid of age 8 yrs with secondry glaucoma in right eye to bring down the pressure?combination drops seems to be exhausted and pressures are ranging 22-23.Surgery is advised but i do'nt find it fine to operate a child with pressures of this range.Does anybody feels the same too?Also more because child has anxiety disorder(medical anxiety as its root)  and surgery will only worsen that .Dortas 3 times and xalacom once in night are used currently.Please help.