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"Sabherwal, Shalinder"
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Willingness to pay for a second pair of near-vision glasses: a cross-sectional study in a rural North Indian population
by
Bastawrous, Andrew
,
Nathawat, Rakhi
,
Sabherwal, Shalinder
in
Adult
,
Availability
,
Biostatistics
2025
Purpose
There is an enormous unmet need for near vision correction with glasses. The cost and lack of felt need are important barriers. This study, which was conducted among a rural population of northern India, was designed to assess whether the short-term use of a pair of near-vision glasses can increase the desirability for individuals to procure subsequent pairs and to further assess the willingness to pay thresholds.
Methods
This study followed a quasi-experimental design. Uncorrected presbyopes were given near vision glasses at their doorstep, to carry out their chosen near work task for half- an- hour (this use of glasses was referred to as ‘experience’ for the purpose of this study). They were then referred to nearby vision centres to procure glasses. This ‘experience’ given was used as a proxy for having used the first pair. At the vision centre, glasses were offered at no cost, for Indian Rupees 75 (US$0.90) and for Indian Rupees 100 (US$1.20) in the first, second and third phases of the study, respectively. The usual price at which near-vision glasses were otherwise available in the region was Indian Rupees150 (US$1.8). The uptake of glasses after having received the near correction experience was tracked via the Peek Vision platform.
Results
The most preferred chosen near work task by the study participants were stitching, after threading the needle and using a mobile phone. The uptake of near-vision glasses from the vision centre after providing the desired experience was 81.4% (835/1,026), 48.3% (699/1,446) and 29.2% (93/318) when the glasses were provided free of cost, at $0.90 and at $1.20 respectively. The difference between these three phases was statistically significant (
p
< 0.001). Uptake was found to be increase with need for increasing lens power (
p
< 0.01) and especially among those who reported the ‘experience’ as ‘very good’ or ‘excellent’(
p
< 0.001). Uptake decreased with increasing age (
p
< 0.01). Differences in uptake between sexes and between those with or without the availability of a mode of transport in their household were not found to be significant.
Conclusion
Having experience with the first pair of near-vision glasses can increase desirability of procuring subsequent pairs. Offering the second pair at a reduced price can increase the uptake substantially in this setting, suggesting that active outreach to correct near vision in tandem with accessible and affordable marketplaces for reading glasses could provide a viable solution to scale near vision correction.
Journal Article
Assessing the reliability of tele-refraction for real time consultation with a remote optometrist
2024
Uncorrected refractive errors pose a significant challenge globally, particularly in remote regions of low-middle income countries where access to optometric care is often limited. Telerefraction, which involves refraction by a trained technician followed by real-time consultation with remote optometrist, is a promising approach for such remote settings. This study aimed to evaluate the accuracy of this model.
This prospective study, conducted in New Delhi, compared tele-refraction to in-person examinations. Trained technicians used a simple device, Click-check, to perform objective refraction and a tele-refraction platform to enter the findings of objective refraction. Final prescription was made after consulting a remote optometrist on that platform. Masked face-to-face optometrists served as the gold standard. The study involved refraction in 222 patients and 428 eyes.
Tele-refraction demonstrated a strong agreement with in-person optometry, achieving 84.6% in spherical correction and 81% conformity in spherical equivalent. The mean difference of spherical equivalent between the two arms was only 0.11 D. The consultation with a remote optometrist improved conformity of spherical equivalent by 14.8% over objective refraction. 82 percent eyes matched in best corrected visual acuity and 92 percent were within 0.1 logMAR difference. For cylindrical axis, 74% eye were within acceptable 10 degrees of difference. The mismatch amongst the individual trained technicians, in terms of difference between the tele-refraction arm and the face-to face optometrist arm was found to be significant for cylindrical axis and not for spherical power and spherical equivalent.
Our study found tele-refraction by a trained technician comparable to refraction done by face-to-face optometrist. Tele-refraction, coupled with remote optometrist guidance can address the optometry resource gap in underserved areas. Thus, this model offers a transformative approach to enhancing the accessibility and quality of eye care services, which can significantly contribute to our efforts in achieving the global targets set by the World Health Organization for effective refractive error coverage. More standardized training for these technicians on ClickCheckTM for detecting the cylindrical axis with better accuracy, can improve this model further.
Journal Article
Rapid sequential mixed-method study to identify barriers and explore solutions for improving equitable access to community-based eye care services in Uttar Pradesh, India
2025
ObjectiveIn low-income and middle-income countries, significant geographical and socioeconomic inequalities affect access to eye care. This study explores an equity-focused approach to improve access to eye care services provided by a community-based eye care organisation in northern India.DesignA sequential exploratory mixed-method approach.SettingA high-volume eye screening programme in north Indian villages. Individuals identified with eye care needs during the screening were referred to the six nearby primary eye care centres.Participants7578 individuals identified with eye needs through a community-based eye screening programme. Of these, 4431 (58.6%) were women and 3137 (41.4%) were men.Socioeconomic questions, developed by experts and lay representatives, were integrated into an ongoing digitally supported (Peek Vision) eye screening programme in north Indian villages. Data from referred individuals identified with eye needs were analysed using logistic regression with a mixed-effect model to identify socioeconomic characteristics most strongly associated with poor access to care after referral. A sequential exploratory mixed-method approach, including in-person interviews and follow-up telephonic surveys of individuals with these characteristics, was used.OutcomeTo identify barriers and gather suggestions for improving attendance from groups least likely to attend services.ResultsOf 7627 individuals referred for eye care, 7578 (99.3%) participated in the study. Of those, 2937 (38.5%) attended the Vision Centre, to which they were referred. The least likely to attend were individuals aged >16, those with dependents, and those referred for non-cataract conditions. Among the 3939 individuals with all three characteristics, the attendance rate was 35.3% compared with 42.5% (p<0.001) among the rest. Interviews with this group highlighted transport, personalised counselling, information dissemination, subsidised spectacles and village leader involvement as key suggestions. A telephonic survey with 400 individuals confirmed that the top priorities were free transport, personalised counselling and subsidised spectacles.ConclusionSuggested programme improvements, including better counselling, reminder calls and transportation, could increase access among those least likely to access services after referral. This study demonstrates a two-step approach for identifying solutions from individuals facing the most significant barriers to care. We will go on to conduct trials of these suggested interventions.
Journal Article
The economic and social costs of visual impairment and blindness in India
by
Khanna, Rohit K
,
Sil, Asim
,
Wong, Brad
in
Blindness
,
Blindness - epidemiology
,
Care and treatment
2022
Purpose:
To provide a current estimate of the economic and social costs (or welfare costs) of visual impairment and blindness in India.
Methods:
Using evidence from the recently conducted Blindness and Visual Impairment Survey across India, the Lancet Global Health Commission on Global Eye Health and other sources, we developed an economic model that estimates the costs of reduced employment, elevated mortality risk, education loss for children, productivity loss in employment, welfare loss for the unemployed, and caregiver costs associated with moderate and severe visual impairment (MSVI) and blindness. Probabilistic sensitivity analyses were also conducted by varying key parameters simultaneously.
Results:
The costs of MSVI and blindness in India in 2019 are estimated at INR 1,158 billion (range: INR 947-1,427 billion) or $54.4 billion at purchasing power parity exchange rates (range: $44.5-67.0 billion), accounting for all six cost streams. The largest cost was for the loss of employment, whereas the the second largest cost was for caregiver time. A more conservative estimate focusing only on employment loss and elevated mortality risk yielded a cost of INR 504 billion (range: INR 348-621 billion) or $23.7 billion (range: $16.3-29.2 billion).
Conclusion:
Poor eye health imposes a non-trivial recurring cost to the Indian economy equivalent to 0.47% to 0.70% of GDP in the primary scenario, a substantial constraint on the country's growth aspirations. Furthermore, the absolute costs of poor eye health will increase over time as India ages and becomes wealthier unless further progress is made in reducing the prevalence of MSVI and blindness.
Journal Article
Assessment of COVID-19-related awareness, knowledge, prevention practices and challenges faced by truck drivers in major transport cities of India: a cross-sectional survey
by
Sabherwal, Shalinder
,
Sood, Ishaana
,
Chinnakaran, Anand
in
Cities
,
Communicable Disease Control
,
Consent
2022
ObjectivesTo assess COVID-19-related awareness and knowledge among truck drivers across India and report prevention practices followed, and challenges faced, by them during the COVID-19 lockdown.DesignCross-sectional study.SettingDelhi, Kanpur, Kolkata and Bangalore from July to September 2020.ParticipantsData were collected in Hindi using a structured questionnaire via telephonic interviews. Minimum 200 drivers were included from each location.Outcome measuresSociodemographic profile, awareness regarding COVID-19, knowledge regarding infection sources, disease spread and vulnerable populations, prevention practices followed and challenges faced. Information sources were also assessed.ResultsFisher’s exact test and Analysis of variance (ANOVA) test were used to check for significant differences across proportions. P value less than 0.05 was considered significant. Overall, 1246 drivers were included, with 72% response rate. Of 1246 drivers, 65% were 30–50 years of age. A majority correctly answered knowledge questions regarding communicability (95%) and fatality (66%). Fifty per cent drivers were aware of treatability of the disease, while only 43% and 24% correctly reported all signs and symptoms and routes of transmission, respectively. No driver was aware of all high-risk populations. Overall Knowledge Score is significantly associated with region. Mobile phones were the primary source of information across all regions. Over two-third drivers follow all prevention practices regularly, which differed significantly across regions. Following standard prevention practices was positively correlated with higher knowledge scores and was significantly correlated with mask use. Worry about the disease was common. Less than 40% drivers received full payment for work during this period, while 25% drivers were unable to return home due to the pandemic. Seven per cent and 26% drivers had either limited or no access to food and health services, respectively.ConclusionsAwareness activities and employer provisioned social security/health insurance might safeguard this vulnerable population till the pandemic fully abates as well as in similar situations in the future.
Journal Article
Comparison of eyecare utilization at two service delivery levels during the COVID-19 pandemic as a measure of their impact: A multicentric retrospective analysis across four North Indian high-volume eyecare organizations
2022
Purpose:
The purpose of this study was to assess the performance of the tertiary centers (TCS) and vision centers (VCs) of the four organizations participating in this research, once the lockdown was lifted, and to compare it with the performance during the same period of the previous year.
Methods:
This was a cross-sectional study assessing eyecare utilization in the first 2 months after resumption of services post the lockdown in 2020 and comparing that across the same time period in 2019. Anonymized data containing basic demographic details, proportions of patient visits and their reasons, as well as referral information was collected. The drop percentage method was used, and P values were calculated using paired t-tests.
Results:
Four TCs and 60 VCs were included. Overall, outpatient attendance dipped 51.2% at TCs and 27.5% at VCs, across the 2 years. At both levels of care delivery, the percentage drop in females was more than that in males; however, the overall drop at VCs was less than that at TCs, for both sexes. Eyecare utilization in pediatric populations dropped significantly more than in adult populations, across the overall sample. There was no significant change in referrals for refractive error as a proportion of total outpatients, although there was a significant decline in the same for cataract and specialty treatment.
Conclusion:
VCs are valuable and successful model for eyecare delivery especially in the continued aftermath of the COVID-19 pandemic.
Journal Article
Estimating the need for diabetic retinopathy services in north India: evidence from a population-based survey in the catchment population of an eye care provider in central Uttar Pradesh
by
B R, Shamanna
,
Lakhani, Basitali
,
Sood, Ishaana
in
Aged
,
Catchment Area, Health
,
Cross-Sectional Studies
2025
ObjectiveThe aim of this study was to assess the prevalence of diabetic retinopathy (DR) and retina screening coverage among people with diabetes in the catchment area of a high-volume eye care organisation in north India.DesignA population-based cross-sectional study using Rapid Assessment of Avoidable Blindness survey, including the DR module.SettingA customised rural district in the catchment of Dr Shroff’s Charity Eye Hospital in Uttar Pradesh in north India.Participants4095 people of age 50 years and above were enrolled using a two-staged cluster sampling, 3867 (94.4%) participated; 2167 (52.9%) were women. 3803 of 4095 (92.9%) participants were assessed for diabetes. People with already diagnosed diabetes and anyone with a random blood glucose ≥200 mg/dL were offered dilated fundus examination.Primary and secondary outcomesPrimary and secondary outcomes were the prevalence of DR and screening coverage for DR, respectively.ResultsThe prevalence of diabetes was 7.0% (95% CI 5.9% to 8.0%). 50.2% of all people with diabetes were newly detected. The prevalence of any DR among people with diabetes who consented to dilated pupillary examination was 22.8% (51 of 224), (95% CI 18.2% to 27.3%). 5.8% (13/224) of people with diabetes were found to have sight-threatening DR and only 15.4% (2/13) had received treatment. 84.8% of people with previously diagnosed diabetes had never had their eyes tested for DR; this was significantly higher in women (90.2% vs 76.0%, respectively, p<0.001). 76% of people with previously diagnosed diabetes had poorly controlled diabetes; this was significantly higher for those on non-allopathic treatment (p<0.01). The odds of DR were higher with duration of diabetes >10 years and poor glycaemic control (OR of 1.8 and 1.6, respectively), but this was not found to be statistically significant.ConclusionThe prevalence of DR in this predominantly rural setting was found to be higher than the national average. Coverage of retinal screening and treatment was found to be very low. Working with general health providers to increase detection of people with diabetes and leveraging vision centres to improve DR screening coverage is needed in this region.
Journal Article
Protocol for an adaptive platform trial of intended service user-derived interventions to equitably reduce non-attendance in eye screening programmes in Botswana, India, Kenya and Nepal
by
Mishra, Sailesh
,
Carpenter, James R
,
Nkomazana, Oathokwa
in
Automation
,
Bayes Theorem
,
Botswana
2025
IntroductionOnly 30%–50% of people referred to clinics during community-based eye screening are able to access care in Botswana, India, Kenya and Nepal. The access rate is even lower for certain population groups. This platform trial aims to test multiple, iterative, low-risk public health interventions and simple service modifications with a series of individual randomised controlled trials (RCT) conducted in each country, with the aim of increasing the proportion of people attending.Methods and analysisWe will set up a platform trial in each country to govern the running of a series of pragmatic, adaptive, embedded, parallel, multiarm, superiority RCTs to test a series of service modifications suggested by intended service users. The aim is to identify serial marginal gains that cumulatively result in large improvements to equity and access. The primary outcome will be the probability of accessing treatment among the population group with the worst access at baseline. We will calculate Bayesian posterior probabilities of clinic attendance in each arm every 72 hours. Each RCT will continually recruit participants until the following default stopping rules have been met: >95% probability that one arm is best; >95% probability that the difference between the best arm and the arms remaining in the trial is <1%; or 10 000 people have been recruited. Lower thresholds may be used for RCTs testing interventions with very low risks and costs. The specific design of cluster RCTs will be determined by our research team once the intervention is known, but the population and outcome will be the same across all trials.This adaptive platform trial will be used to identify effective service modifications, driving continuous improvements in access.Ethics and disseminationThis trial has been approved by the research ethics committee at the London School of Hygiene & Tropical Medicine (ref: 29549). Approvals for individual interventions will be sought from UK and local ethics committees. Results will be shared via local workshops, social media and peer-reviewed publications.Trial registration numberISRCTN53970958.
Journal Article
ROP screening and treatment in four district-level special newborn care units in India: a cross-sectional study of screening and treatment rates
2021
ObjectiveBlindness from retinopathy of prematurity (ROP) in middle-income countries is generally due to absence of screening or inadequate screening. The objective of this study was to assess uptake of services in an ROP programme in four district-level special newborn care units in India.DesignCross-sectional study.SettingAll four neonatal units of a state in India where model programme for ROP had been introducedPatientsInfants eligible for screening and treatment of ROP between March and May 2017.InterventionData on sex, birth weight and gestational age of eligible infants were collected and medical records reviewed for follow-up.Main outcome measuresProportion of eligible infants screened and for those screened, age at first screening, completion of screening, diagnosis and treatment received if indicated. The characteristics of infants screened and not screened were compared.Results137 (18%) of the 751 infants eligible for screening were screened at least once, with no statistically significant difference by sex. The mean birth weight and gestational age of those screened were significantly lower than those not screened. Among those screened, 43% underwent first screening later than recommended and 44% had incomplete follow-up. Fourteen infants (11% of those screened) were diagnosed with ROP. Five were advised laser treatment and all complied.ConclusionUptake, completion and timing of first screening was suboptimal. Some planned interventions including training of nursing staff, use of integrated data-management software and providing material for parent counselling, which have been initiated, need to be fully implemented to improve uptake of ROP screening services.
Journal Article
Identifying barriers and potential solutions to improve equitable access to community eye services: an exploratory sequential mixed methods study protocol
by
Mishra, Sailesh
,
Allen, Luke Nelson
,
Nkomazana, Oathokwa
in
Beneficiaries
,
Botswana
,
change management
2025
IntroductionAccess to care varies by sociodemographic group, with some groups facing higher barriers to care than others. This study will use novel methods to explore barriers and potential solutions as perceived by members of the population groups who are least able to access care. We aim to use rapid yet robust mixed methods that allow us to identify generalisable findings within each programme and testable service modifications to improve equitable access to care; delivering non-tokenistic findings within a matter of weeks.Methods and analysisThis is a multiphased exploratory sequential mixed methods study. We will use the same approach in four different screening programmes, in Botswana, India, Kenya and Nepal. First, we will conduct interviews with people purposively selected from the sociodemographic subgroups with the lowest odds of accessing care within each programme. We will explore their perceptions of barriers and potential service modifications that could boost attendance at eye clinics among people from these ‘left-behind’ groups. We will use a deductive analytic matrix to facilitate the rapid analysis of qualitative data. Space will be made for the inductive identification of themes that are not necessarily captured in the framework. Sample size will be determined by thematic saturation. Next, we will conduct a survey with a representative sample of non-attenders from the same left-behind groups, asking them to rank each suggested service modification by likely impact. Finally, we will convene a multistakeholder workshop to assess each service modification based on ranking, likely impact, feasibility, cost and potential risks. The most promising service modifications will be implemented and evaluated in a follow-on randomised controlled trial, the methods for which will be reported elsewhere.Ethics and disseminationThis project has been approved by independent research ethics committees in Botswana, Kenya, India, Nepal and the UK. We will disseminate our findings through local community advisory boards, national eye screening meetings, in peer-reviewed journals and at conferences.
Journal Article