?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.