Chapter VII
Diseases of the eye and adnexa
(H00-H59)

Visual disturbances and blindness
(H53-H54)

H53 Visual disturbances
H53.0 Amblyopia ex anopsia
Amblyopia:
· anisometropic
· deprivation
· strabismic
H53.1 Subjective visual disturbances




#		 Asthenopia
Day blindness
Hemeralopia
Metamorphopsia
Oscillopsia
Photophobia
Scintillating scotoma
Sudden visual loss
Visual halos
Excludes: visual hallucinations ( R44.1 )
H53.2 Diplopia
Double vision
H53.3 Other disorders of binocular vision
Abnormal retinal correspondence
Fusion with defective stereopsis
Simultaneous visual perception without fusion
Suppression of binocular vision
H53.4 Visual field defects
Enlarged blind spot
Generalized contraction of visual field
Hemianop(s)ia (heteronymous)(homonymous)
Quadrant anop(s)ia
Scotoma:
· arcuate
· Bjerrum
· central
· ring
H53.5 Colour vision deficiencies
Achromatopsia
Acquired colour vision deficiency
Colour blindness
Deuteranomaly
Deuteranopia
Protanomaly
Protanopia
Tritanomaly
Tritanopia
Excludes: day blindness ( H53.1 )
H53.6 Night blindness
Excludes: due to vitamin A deficiency ( E50.5 )
H53.8 Other visual disturbances
H53.9 Visual disturbance, unspecified

H54 Blindness and low vision
Note: For definition of visual impairment categories see table below.
Excludes: amaurosis fugax ( G45.3 )
H54.0 Blindness, both eyes
Visual impairment categories 3, 4, 5 in both eyes.
H54.1 Blindness, one eye, low vision other eye
Visual impairment categories 3, 4, 5 in one eye, with categories 1 or 2 in the other eye.
H54.2 Low vision, both eyes
Visual impairment categories 1 or 2 in both eyes.
H54.3 Unqualified visual loss, both eyes
Visual impairment category 9 in both eyes.
H54.4 Blindness, one eye
Visual impairment categories 3, 4, 5 in one eye [normal vision in other eye].
H54.5 Low vision, one eye
Visual impairment categories 1 or 2 in one eye [normal vision in other eye].
H54.6 Unqualified visual loss, one eye
Visual impairment category 9 in one eye [normal vision in other eye].
H54.7 Unspecified visual loss
Visual impairment category 9 NOS.
Note: The table below gives a classification of severity of visual impairment recommended by a WHO Study Group on the Prevention of Blindness, Geneva, 6-10 November l972.
[Foot note: WHO Technical Report Series No. 518, 1973]

The term "low vision" in category H54 comprises categories 1 and 2 of the table, the term "blindness" categories 3, 4 and 5, and the term "unqualified visual loss" category 9.

If the extent of the visual field is taken into account, patients with a field no greater than 10 o but greater than 5 o around central fixation should be placed in category 3 and patients with a field no greater than 5 o around central fixation should be placed in category 4, even if the central acuity is not impaired.

Category of
visual impairment		Visual acuity with best possible correction
 Maximum less than:Minimum equal to or better than
16/186/60
3/10 (0,3)1/10 (0,1)
20/7020/200
26/603/60
1/10 (0,1)1/20 (0,05)
20/20020/400
33/601/60 (finger counting at 1 metre)
1/20 (0,05)1/50 (0,02)
20/4005/300 (20/1200)
41/60 (finger counting at 1 metre)Light perception
1/50 (0,02)
5/300
5No light perception
9Undetermined or unspecified