National Blindness & Visual Impairment Survey 2015-2019

Cataract Surgery- Coverage, Outcomes and Barriers in population aged ≥ 50 years of India

Data on cataract details was obtained from the 50+ population survey result. The cataract surgical coverage among people with Best Corrected Visual Acuity <3/60, <6/60 and <6/18 were 93.2%, 89.0% and 74.0% respectively. Majority (94.3%) of surgeries were with intra-ocular implants. More than half the surgeries (60.7%) were taking place in NGO/private set-up. The important barriers to cataract surgery were financial constraint and local reason/individual problems like no one to accompany, some other engagement at home etc.

 

Definition of various categories of visual impairment
Blindness

Presenting visual acuity < 3/60 in better eye

Severe Visual Impairment (SVI)

Presenting visual acuity < 6/60 – 3/60 in better eye

Moderate Visual Impairment (MVI)

Presenting visual acuity < 6/18 – 6/60 in better eye

Early Visual Impairment (EVI)

Presenting visual acuity < 6/12 – 6/18 in better eye

Moderate Severe Visual Impairment (MSVI)

Presenting visual acuity <6/18-3/60 in better eye

Visual Impairment

Presenting visual acuity < 6/18 in better eye

Functional Low Vision

A person with impairment of visual functioning even after treatment and/or standard refractive correction, and a visual acuity of less than 6/18 to light perception, or a visual field of less than 10 degree from the point of fixation.

Cataract Surgical Coverage (Person) indicates how many persons received cataract surgery (one or both eyes) among all who were bilaterally pinhole blind due to cataract.
The numerator includes persons with one operated and one pinhole blind eye and persons with bilateral (pseudo) aphakia. The denominator includes the numerator, plus persons bilaterally pinhole blind due to cataract. Besides this, the indicator can also be calculated separately for PinVA <6/60 and <6/18.

Cataract Surgical Coverage (Eye) measures the proportions of eyes pinhole blind due to cataract, which have been operated so far.
The numerator includes all (pseudo) aphakic eyes. The denominator includes the numerator, plus eyes pinhole blind due to cataract. Besides this, the indicator can also be calculated separately for PinVA <6/60 and <6/18.

Table: Prevalence of pseudophakia and aphakia in population aged ≥ 50 years

Pseudophakia/AphakiaMale (%)
Female (%)
Total (%)
Bilateral pseudophakia/aphakia8.049.89 8.96
Unilateral pseudophakia/aphakia8.6910.23 9.46
Eyes pseudophakia/aphakia12.3815.0113.69

Table: Cataract surgical coverage in population aged ≥ 50 years

 Males (%)Females (%)Total (%)
Cataract surgical coverage (persons)
Pin hole VA < 3/60 94.8 91.9 93.2
Pin hole VA < 6/60 90.7 87.7 89.0
Pin hole VA < 6/18 75.6 72.7 74.0
Cataract surgical coverage (eyes)
Pin hole VA < 3/60 81.8 78.9 80.2
Pin hole VA < 6/60 76.0 73.4 74.6
Pin hole VA < 6/18 57.7 56.9 57.2

Table: Prevalence of blindness and visual impairment due to cataract in population aged ≥ 50 years

Pinhole vision category-wise cataract Male (%) Female (%)Total (%)
Cataract and pinhole VA<3/60 in better eye
Bilateral cataract0.59 1.090.84
Unilateral cataract4.12 5.284.70
Cataract eyes2.65 3.733.19
Cataract and pinhole VA<6/60 in better eye
Bilateral cataract1.17 1.881.53
Unilateral cataract5.45 6.796.12
Cataract eyes3.78 5.094.43
Cataract and pinhole VA<6/18 in better eye
Bilateral cataract4.31 5.885.09
Unilateral cataract10.1911.3910.79
Cataract eyes8.8910.799.84

Table: Visual outcomes by type of cataract surgery (eyes) in population aged ≥ 50 years

 Presenting visual acuity (PVA)Best corrected visual acuity (BCVA)
Non-IOL %IOL %Total %Non-IOL %IOL %Total %
Very good: can see 6/1215.360.357.826.276.373.4
Good <6/12- 6/1813.618.017.719.39.910.5
Borderline <6/18-6/6018.113.313.617.57.07.6
Poor < 6/6053.08.410.937.16.88.5

Table: Cause of PVA<6/18 (borderline and poor outcome) after cataract surgery in population aged ≥ 50 years

 Ocular comorbidity (%)Operative complications (%)Refractive error (%)Long term complications (%)
Borderline <6/18-6/6020.333.925.919.9
Poor <6/6041.431.28.818.7

Table: Barriers to cataract surgery in pinhole VA<3/60 due to cataract in population aged ≥ 50 years

 Males (%)Females (%)Total (%)
Need not felt16.417.917.4
Fear11.617.015.3
Cost33.622.626.2
Treatment denied by provider (including
systemic comorbidities)
6.88.78.1
Unaware treatment is possible2.83.02.9
Cannot access treatment6.48.17.6
Local reason (seasonal preferences, personal
reasons, no one to accompany)
22.422.622.5