Keyword Analysis & Research: visual acuity cn

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Frequently Asked Questions

How do you assess the visual acuity of a patient?

Begin by assessing the patient’s visual acuity using a Snellen chart. If the patient normally uses distance glasses, ensure these are worn for the assessment. 1. Stand the patient at 6 metres from the Snellen chart. 2. Ask the patient to cover one eye and read the lowest line they are able to.

What is the difference between visual acuity and visual field testing?

Visual acuity testing examines the integrity of the optic nerves (CN2) and the optic pathways, including the visual cortex. Visual field testing (CN 2) examines the integrity of the optic nerves (CN2) and the optic pathways.

How do you record visual acuity on a chart?

Visual acuity is recorded as chart distance (numerator) over the number of the lowest line read (denominator): If the patient reads the 6/6 line but gets 2 letters incorrect, you would record this as 6/6 (-2). If the patient gets more than 2 letters wrong, then the previous line should be recorded as their acuity.

What are the causes of decreased visual acuity?

Decreased visual acuity has many potential causes including: 1 Refractive errors 2 Amblyopia 3 Ocular media opacities such as cataract or corneal scarring 4 Retinal diseases such as age-related macular degeneration 5 Optic nerve (CN II) pathology such as optic neuritis 6 Lesions higher in the visual pathways More ...

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