1. Miller NR: Walsh and Hoyt's Clinical Neurophthalmology, Volume 2, Baltimore, Williams and Wilkins, 1985, pp. 469–507.
2. Bajandas FJ, Lanning BK: Neurophthalmology Review Manual. Thorofare, N.J.: Slack Inc., 1987, pp. 109–124.
3. Ocular coloboma
4. Midbrain Corectopia