OBJECTIVE: To determine the post surgical stability of ocular alignment in constant
DESIGN: Retrospective observational clinical analysis.
SETTING AND PERIOD: Department of ophthalmology, Unit-III. Liaquat University
Eye hospital, Hyderabad from January 2003 to December 2008.
METHODS: This study was conducted on patients of all ages with socially noticeable
exodeviation undergoing strabismus surgery. Anterior segment slit lamp examination and
if possible posterior segment examination with 90 D and 78 D fundoscopes was performed.
Angle of deviation was measured in prismatic diopters (PD). Surgical intervention was
carried out under general anesthesia. Single surgery was performed on each registered
patient. Postoperative follow-up was done at 3 days, 15 days, 3 months and 6 months.
RESULTS: Thirty five patients underwent surgical correction of exotropia. Twenty seven
(77.1%) completed post-operative follow up of six months. 66.6% subjects retained
orthophoria after surgery. 18.6% patients experienced residual deviation and 14.8%
exhibited consecutive deviation at sixth month post-operative follow up.
CONCLUSION: The timely surgical correction of exotropia successfully restores visual
alignment, binocular function and a high degree of patient's satisfaction.
KEY WORDS: Exodeviation; surgical management; orthophoria.
Strabismus is an ophthalmic syndrome characterized by a deviation of visual axis from
bi-foveal fixation. It is a common problem in ophthalmology. The global prevalence of
strabismus ranges from 3% to 5 %.1, 2 According to one racial survey, the strabismus was
detected in 2% to 4% of white population, 0.6 % in Asians 3 and Africans. 4 In a study
from Sydney Australia the prevalence of strabismus was found in 48 patients (2.8% of
total population). 5 In one local survey among Afghan refugees in Pakistan, the squint
was detected in 1.4% subjects.6 In another local study from Peshawar in 2004 the over
all prevalence of strabismus was 2%. 7
Exotropia is more commo