The Relationship Between the Amount of Binasal Occlusion and Pupillary Distance in Relieving Near Visual Discomfort.

Title The Relationship Between the Amount of Binasal Occlusion and Pupillary Distance in Relieving Near Visual Discomfort.
Author, Co-Author Brian Trieu
Topic Binocular Vision/Pediatrics
Year
2016
Day
Thursday
Program Number
165008
Room
Ballroom A-B
Affiliation
Abstract

Purpose: To investigate the relationship between the pupillary distance (PD) of a near esophoric or esotropic patients and the amount of binasal occlusion (BNO) needed in order to manage asthenopic symptoms.

Methods: A year long study involved 19 optometric students with any form of eso eye posture and any asthenopia symptoms while reading, or doing near electronic device work at 40cm. Patient’s monocular and binocular pupillary distances were measured and assessed against the amount of BNO necessary to relieve symptoms of asthenopia after 2 hours of near work. The effectiveness of the BNO was assessed by comparing the results of the baseline BNO quality of life (QOL) near symptom survey with the postBNO quality of life (QOL) near symptom survey.

Results: Average baseline responses for baseline BNO QOL near symptom survey were 10.35 ± 0.171 and post BNO QOL near symptom survey was 5.8 ± 0.93. The Wilcoxon Signed-Rank test for baseline versus post BNO QOL near symptom survey passed the normality test W=-130.00, T+= 20.50, T-=-150.50, Z-Statistic =-2.834, P(est.) = 0.005 and P(exact) =0.003. Average BNO used on patients in relation to pupillary distance was 66% ± 2.11 OD, 66% ± 1.86 OS, or 66% ± 1.95 OU.

Conclusion: Participants reported a statistically significant improvement on the BNO QOL near symptom survey after doing 2 hours of near work with binasal occlusion as opposed to near work with no binasal occlusion. The measured amount of binasal occlusion used on each participant was found to be 66% of the patient monocular or binocular pupillary distance.

Affiliation of Co-Authors
Outline