Table 3 List of assessments

Subjective ophthalmological assessment

Visual acuity

ETDRS logMAR

Reading speed, near visual acuity

Radner Reading Chart

Visual fields

Humphrey field analyser 30–2, Amsler grid

Contrast vision

Low-contrast letter charts (Pelli-Robson),

Colour vision

Ishihara plates/Farnsworth Munsell hue test (desaturated 15D)

Ocular motility

Eye follow movements, Cover test 30 cm and 6 m, Prism test (15 diopter), Eye-Tracking

Facial emotion recognition

Emotion Recognition Inventory (ERI)

Visual function

VFQ-25, Visual impairment screening questionnaire

Objective ophthalmological assessment

Lens opacity

Slit lamp examination

Fundus appearance

Color Fundusphotography (7-fields)

Corneal thickness

Pachymetry

Intraocular pressure

(Goldmann) tonometry

Tear production

Schirmer’s test, TearFilmBreakUpTime, eye blink rate

Anatomical changes of the retina including thickness

Spectral-domain OCT (Heidelberg)

Retinal micro vascular changes

Angio-OCT (Heidelberg)

Outcome

Neurological assessment

PD-related disability and impairment

MDS-UPDRS, Schwab & England activities of Daily living, NMSS, PDQ-39.

Gait and Balance

Timed Up and Go test, Single Leg Stance test, Gait Speed (4 m walking), Dual tasking, Freezing of Gait, Tandem gait

Hand-eye coordination

9 Hole Pegboard test

Cognitive function

MoCA, CLOX

Mood

GDS