she completed her internship at the u.s. naval air station in brunswick, maine, the houston light house for the blind, and the university eye clinic, in houston, tx. dr. leung's research involved 2 areas; 1) the detection of infant color vision, and 2) the treatment of nystagmus. her research involving nystagmus was presented at the american academy of optometry in 1990, and published in "optometry and vision science", the journal published by the american academy of optometry, in 1996.

dr. leung pursued a post-doctorate residency in binocular vision and pediatric optometry, at the southern california college of optometry, in fullerton, ca. she taught in the pediatric and vision therapy departments at the southern california college of optometry for 4 years. dr. leung has obtained board certification in the treatment of ocular diseases. she also serves as a senior and supervisory examiner for the national board of examiners in optometry. (the national board administers licensure examinations for over 40 states.)