Table 1.

Patients with horizontal rectus muscle tendon elongation and long-term follow-up: full extent of deviation in primary position (in prism diopters) preoperatively, at the first postoperative day, in the long term (convergent angles are given in positive, divergent angles in negative values), and angle improvement for residual esotropia (5 patients), residual exotropia (5 patients), oculomotor nerve palsy (7 patients), abducens nerve palsy (5 patients), esotropic Duane’s retraction syndrome (13 patients), exotropic Duane’s retraction syndrome (3 patients)

Patients with long-term measurement	Horizontal angle of squint (Δ) Median (minimum to maximum)					Long-term measurement (weeks) Median (minimum to maximum)
	Preop.	Postop. first day	Long term	Difference preop.-postop. first day	Difference preop.- long term
Residual esotropia 5/6 patients	35 (16 to 40)	12 (0 to 35)	6 (− 8 to 40)	16 (0 to 23)	19 (0 to 43)	188 (6 to 260)
Residual exotropia 5/7 patients	− 35 (− 18 to − 45)	− 16 (− 4 to − 18)	− 10 (1 to − 25)	19 (0 to 41)	20 (8 to 46)	8 (8 to 261)
Oculomotor nerve palsy 7/7 patients	− 45 (− 25 to − 75)	− 10 (0 to − 50)	− 30 (− 8 to − 40)	31 (19 to 40)	15 (5 to 42)	16 (6 to 40)
Abducens nerve palsy 5/7 patients	41 (20 to 53)	8 (2 to 40)	8 (4 to 35)	14 (12 to 48)	18 (12 to 46)	8 (7 to 16)
Esotropic Duane’s retraction syndrome 13/16 patients	25 (9 to 40)	8 (− 2 to 20)	2 (− 8 to 20)	14 (5 to 37)	22 (7 to 48)	8 (5 to 260)
Exotropic Duane’s retraction syndrome 3/3 patients	− 30 (− 12 to − 30)	− 12 (− 4 to − 14)	− 19 (− 5 to − 40)	16 (8 to 18)	6 (− 10 to 11)	11 (9 to 16)