htp://www.avehjournal.org Open Access
African Vision and Eye Health
ISSN: (Online) 2410-1516, (Print) 2413-3183
Page 1 of 7 Original Research
Read online:
Scan this QR
code with your
smart phone or
mobile device
to read online.
Authors:
Zamadonda N.Q.
Xulu-Kasaba
1
Khathutshelo P. Mashige
1
Mawande G. Mthembu
1
Nkululeko S. Mazibuko
1
Ntombi A. Mabunda
1
Ahmed S. Randeree
1
Asharia Parsad
1
Afliatons:
1
Discipline of Optometry,
School of Health Sciences,
University of KwaZulu-Natal,
Durban, South Africa
Corresponding author:
Khathutshelo Mashige,
mashigek@ukzn.ac.za
Dates:
Received: 05 Feb. 2019
Accepted: 15 Jan. 2020
Published: 16 Apr. 2020
How to cite this artcle:
Xulu-Kasaba ZNQ,
Mashige KP, Mthembu MG,
et al. A profle of patents
presentng at a low vision
clinic in a resource-limited
setng. Afr Vision Eye Health.
2020;79(1), a500. htps://doi.
org/10.4102/aveh.v79i1.500
Copyright:
© 2020. The Author(s).
Licensee: AOSIS. This work
is licensed under the
Creatve Commons
Atributon License.
Introducton
The World Health Organization (WHO) defines low vision as ‘visual acuity [VA] less than 6/18
and equal to or better than 3/60 in the better eye with [the] best correction’ and a person with low
vision as:
[O]ne who has impairment even after treatment and/or standard refractive correction, and has a visual
acuity of less than 6/18 to light perception, or a visual field less than 10 degrees from the point of fixation,
but who uses, or is potentially able to use, vision for the planning and/or execution of a task for which
vision is essential.
1
The WHO International Classification of Diseases (ICD)-10 categories of visual loss define
low vision as ‘a corrected visual acuity (VA) in the better eye of 6/18 down to and including
3/60’.
2
This definition includes all individuals regardless of the cause of visual loss. The WHO
recently suggested that ‘presenting visual acuity’ (VA tested with distance spectacles if usually
worn), as well as uncorrected VA, be used in all population-based surveys.
2
The new definition
emanated from the fact that the ICD-10 categories of visual loss do not allow refractive errors
to be assessed as a cause of visual impairment (VI). Most individuals having a presenting VA
of 6/18 in the better eye down to and including 3/60 require correction (such as cataract
Background: The university-based low vision clinic is one of the few low vision clinics in
South Africa.
Aim: To describe demographic and clinical profiles of patients who attended this clinic from
2010 to 2017.
Setting: The university low vision clinic, South Africa.
Methods: The record cards of all patients seen at the low vision clinic over 8 years were
examined and the following information was extracted: age, gender, presenting visual acuity
(VA), VA following low vision assessment, cause of visual impairment and types of low vision
devices recommended.
Results: A total of 621 patients were examined, comprising 45.1% males and 55.9% females
aged 36.0 ± 18.2 years (range: 4–93 years). Many of these patients (33.7%) had presenting VA
worse than 1.3 logarithm of the Minimum Angle of Resolution (logMAR) (> 6/120) at 4 m in
the better eye, and 196 (31.6%) had presenting VA of worse than 1.3 logMAR at near distance.
Following optical low vision assessment, 62.4% had distance VA of 0.9 LogMAR (6/48) to
-0.2 logMAR (6/3.8) and 58.4% had near VA of 0.9 logMAR (6/48) to -0.2 logMAR (6/3.8).
Albinism (22.7%), unknown causes (18.2%), cataract (15.5%) and macular diseases (12.2%)
were the most common causes of low vision. Amblyopia (80.7%) was the most common cause
of low vision in patients aged 20 years and younger, followed by albinism (68.1%) and corneal
diseases (41%). Cataract (78.1%), macular diseases (64.4%) and glaucoma (55.9%) were the
most common causes of low vision in patients aged more than 60 years. Telescopes (33.8%)
were the most commonly recommended form of intervention, followed by magnifiers (29.6%)
and protective measures (24.5%).
Conclusion: Albinism, cataract and macular diseases are the predominant causes of low vision
in patients attending this low vision clinic. There was a significant improvement in VA after
low-vision assessment, particularly for patients with presenting VA of better than 1.3 logMAR
(6/120).
Keywords: low vision; amblyopia; cataract; macular diseases; glaucoma; telescopes;
magnifiers.
A profle of patents presentng at a low vision
clinic in a resource-limited setng
Read online:
Scan this QR
code with your
smart phone or
mobile device
to read online.