Document Detail

Ocular motor behaviour of monozygotic twins with tyrosinase negative oculocutaneous albinism.
MedLine Citation:
PMID:  8025067     Owner:  NLM     Status:  MEDLINE    
The involuntary nystagmus movements of 16-year-old monozygotic twins with tyrosinase negative oculocutaneous albinism were examined. On primary gaze both girls exhibited bilateral conjugate horizontal nystagmus, a jerk with extended foveation waveform, and similar frequencies (2.0 Hz:1.9 Hz), although the fast phases were in opposite directions. The mean amplitudes differed markedly (6.8 degrees:3.7 degrees), as did the position of the null zones (+20 degrees to +30 degrees:-25 degrees to -35 degrees) and the widths of the neutral zones (-25 degrees to +20 degrees:-25 degrees to -35 degrees). Since the twins have identical genotypes these differences must have arisen from other sources.
R V Abadi; E Pascal
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  The British journal of ophthalmology     Volume:  78     ISSN:  0007-1161     ISO Abbreviation:  Br J Ophthalmol     Publication Date:  1994 May 
Date Detail:
Created Date:  1994-08-09     Completed Date:  1994-08-09     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0421041     Medline TA:  Br J Ophthalmol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  349-52     Citation Subset:  IM    
Department of Optometry and Vision Sciences, UMIST, Manchester.
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MeSH Terms
Albinism, Oculocutaneous / enzymology,  physiopathology*
Diseases in Twins*
Fixation, Ocular
Nystagmus, Pathologic / congenital,  enzymology,  physiopathology*
Twins, Monozygotic*

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