Visual Acuity

Question 1

what is used to assess visual acuity

Answer 1

Snellen chart

Question 2

define severely sight impaired

Answer 2

cannot do any work for which eyesight is essential

Question 3

classification of sight impaired

Answer 3

• 3/60 to 6/60 Snellen or equivalent with a full visual field
• Up to 6/24 Snellen or equivalent with moderate contraction of the field, opacities in media or aphakia
• 6/18 Snellen or equivalent or even better if they have a severe field defect, for example hemianopia, or if there is contraction of the visual field, for example in retinitis pigmentosa or glaucoma

Question 4

presentation of Horner’s

Answer 4

constricted pupil
drooping eyelid (ptosis)
reduced sweating on one side