Distance perception in mild traumatic brain injury (mTBI).

Background: The purpose of this study was to assess monocular and binocular distance perception, and stereoacuity, in individuals with mild traumatic brain injury (mTBI) who reported the symptom of "poor depth perception";

Methods: Ten patients with mTBI were tested and compared with ten visually-normal asymptomatic individuals in the following areas: perceived distance, stereoacuity at distance (3 meters) and near (40 cm), and a 9-item 5-point rating-scale questionnaire related to distance perception. Distance perception was assessed under monocular and binocular viewing conditions in both clustered and isolated static environments. Magnitude estimation was used to obtain the distance perception response function of physical versus perceived distance using common objects positioned at distances of 0.

Vision therapy for basic exotropia in adults: 2 case studies.

Background: Basic exotropia accounts for approximately 50% of all intermittent exotropias. Many clinicians view treating these patients, especially adults with childhood-onset exotropia, as challenging. Conflicting opinions still exist regarding prescribing any treatment for adult strabismics, including surgical realignment and optometric vision therapy (VT).