?11 Crawford TJ, Henderson L, Kennard C. 1989. Abnormalities of
non-visually guided eye
movements in Parkinson's Disease. Brain 112:1573-1586.

12 Daniel SE, de Bruin VMS, Lees AJ. 1995. The clinical and pathological
spectrum of Steele-
Richardson-Olszewski syndrome. Brain 118:759-770

13 David NJ, Mackey EA, Smith JL. 1968. Further observations in
progressive supranuclear
palsy. Neurol 18:349-356.

14 de Rijk MC, Tzourio C, Breiteler MMB. 1997. Prevalence of
parkinsonism and Parkinson's
disease in Europe: the EUROPARKINSON Collaborative Study. J Neurol
Neurosurg Psychiatry
62:10-5

15 Ehle AL, Stewart EM, Lellelid NE, Leventhal NA. 1982. Normal
checkerboard pattern
reversal evoked potential in parkinsonism. EEG Clin Neurophysiol.,
54:336-8.

16 Frederick JM, Rayborn ME, Laties AM, Lam DM, Hollyfield JG. 1982.
Dopaminergic neurons
in the human retina. J comp neurol. 210:65-79.

17 Gottlob I, Schneider E, Heider W, Skrandies W. 1987. Alteration of
visual evoked potentials
and electroretinograms in  Parkinson's Disease. EEG Clin Neurophysiol.
66:349-357.

18 Haug DA, Kolle RU, Trenkwalder C, Oertel WH, Paulus W. 1995.
Predominant affection of
the blue cone pathway in Parkinson's Disease.  Brain  118: 771-778.

19 Hunt LA, Sadun AA, Bassi CJ. 1995. Review of the Visual System in
Parkinson's Disease
Optom Vis Sci 72:92-99.

20 Hutton JT,Morris JL, Elias JW. 1994. Levodopa improves spatial
contrast sensitivity in
Parkinson's Disease. Arch Neurol 50:721-724.

21 Inzelberg R, Kippervasser S, Korczyn AD. 1998. Auditory
hallucinations in Parkinson's
Disease. J Neurol Neurosurg Psychiatry 64:533-535.

22 Jacobs DH, Shuren J, Bowers D, Heilman KM. 1995. Emotional facial
imagery , perception
and expression in Parkinson's Disease. Neurol. 45:1696-1702.

23 Jones RD Donaldson IM 1995 fractionation of visuo-perceptual function
in Parkinson's
Disease J neurol sci 131, 43-50.

24 Karson CN, LeWitt PA, Calne DB, Wyatt RJ. 1982. Blink rates in
Parkinsonism. Ann Neurol
12:580-583.

25 Kupersmith MJ, Shakin E, Siegel IM Lieberman A. 1982. Visual system
abnormalities in
patients with Parkinson's Disease. Arch Neurol 39:284-286.

26 Lang AE, Lozano AM. 1998. Parkinson's Disease. NEJM 339: 1044-1053;
1130-1143

27 Levin BE, Llabre NN, Reisman S, Weiner WJ, Sanchez-Ramos J, Singer C,
Brown MC. 1990.
Visuospatial impairments in Parkinson's Disease. Exp Neurol 113:237-248.

28 Mendez MF, Tomsak RL, Remler B. 1990.  Disorders of the visual system
in Alzheimer's
disease. J clin Neuro-Ophthalmol. 10:62-69.

29 Nightingale S, Mitchell KW, Howe JW. 1986. Visual evoked cortical
potentials and pattern
electroretinograms in Parkinson's Disease and control subjects. J Neurol
Neurosurg Psychiatry 49:
1280-1287.

30 Nguyen-Legros J, Harnois C, DiPaolo T, Simon A. 1993. The retinal
dopamine system in
Parkinson's Disease. Clin Vis Sci 8:1-12.

31 Peppe A, Stanzione P, Pierelli F, De Angelis D, Pierantozzi M,
Bernardi G. 1995. Visual
alterations in de novo Parkinson's Disease: Pattern ERG latencies are
more delayed and more
reversible by levodopa than are VEPs. Neurology 45:1144-1148.

32 Price MJ, Feldman RG, Adelberg D, Kayne H. 1992. Abnormalities in
color vision and
contrast sensitivity in  Parkinson's Disease. Neurology 42:887-890.

33 Repka MX, Claro MC, Loupe DN, Reich SG. 1996. Ocular motility in
Parkinson's disease. J
ped ophthalmol strab 33:144-147.

34 Slatt B, Loeffler JD, Hoyt WF. 1966. Oculomotor disturbances in
Parkinson's Disease. Can J
Ophthalmol 1: 267-273.

 35 Smith D,  Ishikawa I, Dhawan IV, Winterkorn JS, Eidelberg, D. 1995
Lid opening apraxia is
associated with medial frontal hypometabolism Movement Disorders
10:341-344.

36 Smith JL. 1966. Ocular signs of parkinsonism. J Neurosurg.
24:284-285.

37 Smith JL. 1968. The eye in parkinsonism. Modern treatment 5:316-320.

38 Straube A, Paulus W, Quintern J, Brandt TH. 1989. Visual ataxia
induced by eye movements
Clin Vis Sci    4:107-113.

39 Tanyeri S, Lueck CJ, Crawford CJ, Kennard J. 1989. Vertical and
horizontal eye movements
in Parkinson's Disease. Neuroophth 9:165-177.

40 Trick GL, Kaskie B, Steinman SB. 1994. Visual impairment in
Parkinson's Disease: defcits in
orientation and motion discrimination. Optom Vis Sci 71:242-245.

41 White OB, St Cyr JA, Tomlinson RD. 1983. Ocular motor deficits in
Parkinson's Disease.
Brain 106: 571-587.

42 Winterkorn JMS, Zak R. 1998.  Diseases of Presumed Infectious
Etiology.  Chapter 73 in
Walsh and Hoyt’s Neuro-Ophthalmology.  5th Ed.  Editors,  Miller NR,
Newman.NJ.
Philadelphia, Williams and Wilkins. Vol 5. Pp 5721- 5747.