Worth 4 Dot App for Determining Size and Depth of Suppression.

Purpose: To describe and evaluate an iOS application suppression test, Worth 4 Dot App (W4DApp), which was designed and developed to assess size and depth of suppression.

Methods: Characteristics of sensory fusion were evaluated in 25 participants (age 12-69 years) with normal (n = 6) and abnormal (n = 19) binocular vision. Suppression zone size and classification of fusion were determined by W4DApp and by flashlight Worth 4 Dot (W4D) responses from 33 cm to 6 m.

Computer monitor pixellation and Sloan letter visual acuity measurement.

Purpose: To assess the effects of changing computer monitor pixel density on visual acuity measurements made using Sloan optotypes.

Methods: Acuity was measured on 10 participants aged 19 to 38 years (mean 27.9 ± 7.

Anterior Corneal, Posterior Corneal, and Lenticular Contributions to Ocular Aberrations.

Purpose: To determine the corneal surfaces and lens contributions to ocular aberrations.

Methods: There were 61 healthy participants with ages ranging from 20 to 55 years and refractions -8.25 diopters (D) to +3.

Influence of Gravity on Ocular Lens Position.

Purpose: We determined whether human ocular lens position is influenced by gravity.

Methods: Anterior chamber depth (ACD) and lens thickness (LT) were determined with a Haag-Streit Lenstar LS900 for right eyes of participants in two age groups, with a young group of 13 participants aged 18 to 21 years (mean, 21 years; SD, 1 year) and an older group of 10 participants aged 50 to 63 years (mean, 58 years; SD, 4 years). There were two sessions for each participant separated by at least 48 hours, with one session for the usual upright head position and one session for a downwards head position.