PMC5525600_01
Preoperative primary position of case 1. Marked left hypotropia was noted
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F1
For the eye position, there was significant left hypotropia at primary position which measured 40 prism diopters when the patient fixed at far target [Figure 1].
Preoperative extraocular muscle of case 1. There was overaction of the left inferior rectus and no underaction of the other muscles
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F2
The duction test showed no limitations in all directions in both eyes, but the version test showed overacting left inferior rectus (LIR) muscle [Figure 2].
Primary position of case 1 after muscle operation for 3 months. The eyes were orthophoric and there was no left lower lid retraction
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F3
Three months after the muscle operation, the eyes were orthophoric at primary position [Figure 3] and the EOM was full and free in all directions [Figure 4] and there was no left lower lid retraction.
Extraocular muscle of case 1 after muscle operation for 3 months. The eye movement was full and free in all directions
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F4
Three months after the muscle operation, the eyes were orthophoric at primary position [Figure 3] and the EOM was full and free in all directions [Figure 4] and there was no left lower lid retraction.
PMC5525600_02
Preoperative primary position of case 2. Marked left hypotropia was noted
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F5
The primary position of eyes showed marked left hypotropia [Figure 5].
Preoperative extraocular muscle of case 2. There was overaction of the left inferior rectus and elevation deficit of the left eye
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F6
For the EOM examination, there existed -2 limitation of supraduction in his left eye and +2 overaction of the LIR [Figure 6].
Primary position of case 2 after muscle operation for 6 months. The eyes were orthophoric and there was mild left lower lid retraction
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F7
Six months later, the eyes were orthophoric at primary position and there showed mild left lower lid retraction [Figure 7]; otherwise, the patient was satisfied with the result [Figure 8].
Extraocular muscle of case 2 after muscle operation for 6 months. The eye movement was full and free in all directions
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F8
Six months later, the eyes were orthophoric at primary position and there showed mild left lower lid retraction [Figure 7]; otherwise, the patient was satisfied with the result [Figure 8].