Session: Poster session A

Use of Strabiscan prototype device for preoperative strabismus angle measurements

Ewa GRUDZINSKA¹, Magdalena DURAJCZYK^1,2, Marek GRUDZI?SKI³, ?ukasz MARCHEWKA³, Monika MODRZEJEWSKA^1,2

¹II Ophthalmology Department, University Clinical Hospital no 2 in Szczecin, Szczecin, Poland
²II Ophthalmology Department, Pomeranian Medical University in Szczecin, Szczecin, Poland
³Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, Poland

Introduction: Measuring the angle of strabismus using the alternating prismatic cover test (APCT) is the gold standard for planning surgery. A complementary test to visualize the maximum angle of deviation is the prismatic adaptation test (PAT). We analyzed the preoperative results of strabismic angle measurements using the Strabiscan prototype device and APCT and compared them with the PAT results.

Methods: 17 patients being prepared for strabismus surgery at the 2nd Department of Ophthalmology of PMU were included in the analysis. The average age of the patients was 18 years (range 5-65 years). The group included 5 patients with convergent strabismus and 12 with divergent strabismus. Each person was given a questionnaire on basic data and medical history. This was followed by an ophthalmologic examination including: evaluation of visual acuity, measurement of refractive error after accommodative paralysis, evaluation of the anterior segment and posterior segment of the eyeball. Subsequently, all patients were measured using the Strabiscan prototype device and APCT. In divergent strabismus, APCT was performed after a 3-hour monocular occlusion, while prism adaptation test time was 30 minutes.

Results: Statistical analysis showed no statistically significant differences in strabismus angle measurements between Strabiscan and APCT for distance or near (p>0.05). Comparison of PAT results to strabismus angle measurements did not highlight statistically significant differences between the methods in the evaluated group of patients (p>0.05).

Conclusions: Measurement of strabismus angle results with the Strabiscan prototype device are comparable to traditionally used methods in people with strabismus.