Botulinum toxin type A (BTA) treatment is an alternative to strabismus
surgery. In this retrospective study the data on 45 esotropic and 49
exotropic patients with concomitant strabismus who were treated with B
TA were analysed for dose-effect relationship, the effect of repeat do
ses and amblyopia on success of botulinum treatment, The esotropic pat
ients were treated with a total of 80 and exotropic patients with 91 i
njections, The deviations were corrected within 5 degrees of straight
in 33% of esotropic and 18% of exotropic patients. In esotropic patien
ts the effect was dose dependent, This relation was not shown in exotr
opic patients, The repeat doses of BTA corrected the deviation to the
same extent as the primary ones for both esotropic and exotropic patie
nts.