Cranial Nerve Examination

OLFACTORY NERVE (I)

Test both perception and identification using aromatic non-irritant materials that avoid stimulation of trigeminal nerve fibres in the nasal mucosa, e.g. soap, tobacco.

One nostril is closed while the patient sniffs with the other.

OPTIC NERVE (II)

light?

Visual acuity:

. severe deficit - Can patient see — movement?

Can patient count fingers? mild deficit - Record reading acuity with wall or hand chart.

N.B. Refractive error (i.e. inadequate focussing on the retina, e.g. hyper-metropia, myopia) can be overcome by testing reading acuity through a pinhole. This concentrates a thin beam of vision on the macula.

Pinhole

Jaeger type card for near vision, labelled according to size [N5 (smallest print) - N48 (largest print)].

Visual acuity is expressed as: _d_ D

Pinhole

Snellen's wall chart

N Distances (D) at which patient is expected to read letters (metres)

Test each eye separately.

36 dek

24MTOP 12 HLQNR

6 SAFZUCW

Snellen's wall chart

N Distances (D) at which patient is expected to read letters (metres)

Test each eye separately.

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