Horizontal and vertical prism adaptation are different mechanisms

• Published in: Ophthalmic & physiological optics Vol. 25; no. 3; pp. 215 - 218
• Main Authors: Brautaset, R. L., Jennings, J. A. M.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 01.05.2005; Blackwell
• Subjects: Adaptation, Ocular - physiology; Adult; Biological and medical sciences; convergence insufficiency; Convergence, Ocular - physiology; Eye and associated structures. Visual pathways and centers. Vision; Fixation, Ocular - physiology; Fundamental and applied biological sciences. Psychology; horizontal; Humans; Medicin och hälsovetenskap; Photic Stimulation - methods; prism; Strabismus - physiopathology; vergence adaptation; Vertebrates: nervous system and sense organs; vertical; Vision, Binocular - physiology; Vertical; Horizontal; vergence adaptation; Ophthalmology; Mechanism of action; Prism; convergence insufficiency; Adaptation
• ISSN: 0275-5408; 1475-1313
• DOI: 10.1111/j.1475-1313.2005.00276.x

As part of a study on subjects with convergence insufficiency (CI), their vertical and horizontal vergence adaptation was assessed and compared with age matched controls in order to investigate whether the horizontal adaptation system can be regarded as being independent of the vertical adaptation system. Using a flashed Maddox rod technique horizontal vergence adaptation was found to be reduced in CI subjects whereas no difference could be found in vertical adaptation. These results confirm that the vertical and horizontal adaptation systems can be treated as independent mechanisms.