The Influence Of Micro Changes In Vertical Eye Position On Eye Cyclotorsion By Fundus Photography

ObjectiveThe influence of slight change of eye position on eyeball vertical rotating wasexplored to give reliable evidence of surgery design.MethodsData of patients who have received treatment in Qingdao Eye Hospital fromJanuary2012to December2012were included and the including criteria were asfollow:6-25years old, no eye movement limitation, no history of eye surgery andtrauma, no vertical strabismus, no amblyopia and astigmatism or compound andmixed astigmatism <1.00D, no systemic disease. Data included axial, curvatureand best corrected visual acuity (BCVA), eye position and function of extraocularmuscles, the binocular visual function and fundus photography. Fundus photographywas taken at first and slight superduct and deorsumvergence eye positions with ZEISSVISUCAMPRO NMfundus camera. Forea-disc angle (FDA) was measured threetimes at different positions with Photoshop, and recorded as FDA, FDA-H(forea-discangle-high position) and FDA-L(forea-disc angle-low position) respectively. Thephoto in which error of data were significant was excluded. A total of128cases wereincluded, and16cases excluded. All photos were measured by two investigators toeliminate the measurement errors caused by subjective factors. The angles wereanalyzed with SPSS17.0software according to different eye position, the function ofbinocular vision, the degree of horizontal strabismus, the equivalent spherical and the function of inferior oblique muscle.ResultsA total of112cases (224eyes) received the relevant examination and whose datawere included. The differences between binocular FDA, binocular FDA-H andbinocular FDA-L were statistically significant by multiple comparisons. The effectsof binocular vision and degree of horizontal strabismus on monocular FDA wereinsignificant. The effects of spherical equivalent and inferior oblique musclesfunction on monocular FDA were statistically insignificant.ConclusionsAccording to Fundus photography, eye is slightly externally rotated at firstposition. The degree of external rotation increase at the position of slightsupravergence, and the degree decrease at the position of slight deorsumvergence.Binocular vision and horizontal strabismus degree have no effect on the changes ofbinocular FDA at different positions. Spherical equivalent and the inferior obliquemuscle function have no effect on the changes of monocular FDA at differentpositions.