Table 1
Summary of study patients
| Case no | Sex | Type* | Age (years) | Refraction | Visual acuity (logMAR) | Nystagmus | Strabismus |
|---|---|---|---|---|---|---|---|
| XT = exotropia; ET = esotropia. | |||||||
| *Type: A = no other midline abnormality on imaging except small chiasm; B = septo-optic dysplasia (optic nerve hypoplasia, hypopituitarism, deficient septum pellucidum); C = skull base encephalocele + agenesis of the corpus callosum + hypopituitarism. | |||||||
| †Angle of strabismus in prism dioptres. | |||||||
| 1 | M | A | 9 | RE −1.50 + 0.50 × 90 | 1.0 | Horizontal | XT small angle† |
| LE 0.00 + 1.00 × 90 | 0.6 | R head turn | V pattern | ||||
| 2 | F | A | 4 | RE 0.00 + 0.50 × 90 | 0.6 | Horizontal | XT small angle |
| LE 0.00 + 1.50 × 90 | 0.5 | Horizontal | V pattern | ||||
| 3 | F | A | 12 | RE +1.50 sph | 0.1 | Minimal rotary nystagmus | ET small angle |
| LE +1.50 sph | 0.6 | Amplitude L>>R | |||||
| 4 | F | B | 4 | RE +1.00 sph | Very poor | Rotary + horizontal | Right XT angle 30 |
| LE +2.00 sph | 0.6 | ||||||
| 5 | F | B | 12 | RE +3.0 sph | Greater than 1.0 | Highly variable | Right ET angle 45 |
| LE +1.0 +4.0 × 90 | 0.6 | Horizontal and vertical(not seesaw) | |||||
| 6 | F | C | 10 | RE −5.00 −1.00 × 80 | 0.7 | Seesaw variant: circumrotary+ dysconjugate vertical | No detectable strabismus |
| LE −3.50 −2.50 × 120 | 0.5 | ||||||
| 7 | M | C | 14 | RE −0.50 +1.00 × 90 | 0.8 | Horizontal | No detectable strabismus |
| LE +1.00 +1.00 × 90 | 0.5 | Left beating, rotary component in 1° | |||||
| 8 | M | C | Deceased | RE −4.50 + 2.00 × 120 | Greater than 1.0 | Type unclear | Vertical gaze palsy |
| LE −1.50 + 1.00 × 180 | 1.0 | ||||||
| 9 | M | Other | 6 | RE +0.50 +1.00 × 120 | 0.6 | Horizontal | No detectable strabismus |
| LE +0.50 +0.50 × 90 | 0.6 | Head shake | |||||
