Effect of Presbyopia Correction on Livelihood and Repayment Among Solar Customers in Western Region, Kenya

Trial statusNot yet recruiting
Trial phaseNot applicable
Trial typeInterventional
Biological sexAll
Age40+
SponsorDot Glasses Kenya

About this trial

With age, people lose the ability to see things that are near them clearly. This is known as presbyopia. Although this is a normal ageing process, it can be corrected with near vision eyeglasses - colloquially known as reading glasses - and people should not have to "put up with" poor near vision. By improving the ability to see things that are up-close, near vision eyeglasses allow people to perform tasks with greater ease. This improves their quality of life, and increases their productivity and income. DOT Glasses provides people in East Africa with a range of eyeglasses, including those to improve near vision.

In addition, products sold to communities through loans repaid at regular intervals (known as asset financing), allow people in underserved communities to harness electricity through solar products and to own electronic devices, such as mobile phones. This also improves their quality of life, and increases their productivity and income. Sun King is one of the leading providers of solar products through loans in Kenya.

This study will gather evidence and insights from existing Sun King customers with poor near vision in Busia, Siaya, Vihiga and Kakamega. The investigators will explore how much giving people glasses to improve their near vision impacts their ability to make repayments, their incomes and livelihoods, and their overall quality of life. It will also be studied how the glasses affect participants usage of the solar device or mobile phone.

Eligibility criteria

This trial does not accept healthy volunteers

Qualifiers

Aged 40 years or older

NVI secondary to presbyopia: presenting NVA <N6 at 40cm, correctable with NVGs to N6 or better at 40cm.

Purchased their product >=3 months ago with >= 6 months of repayments remaining on their PAYG contract.

The product is in the entry level category, priced between KES 7,000 and 30,000 (USD 46 and 196 at prevailing exchange rates during writing).

Disqualifiers

Age under 40 years.

Distance Visual Acuity of worse than 20/40.

Already own NVGs.

Presenting NVA N6 or better at 40 centimetres.

Trial design

Design model

Parallel

Treatments tested in this trial

  • Near vision glasses for presbyopia correction

    Other intervention

    Provision of near vision glasses for presbyopia correction to individuals who did not previously have glasses and have correctable presbyopia

Treatment groups

1,085 Participants
are divided into 2 treatment groups
Group A: Near vision glassesExperimental treatment 1 intervention
Group B: No glassesNo intervention 0 interventions

Trial outcomes

Primary outcomes

1

Repayment behaviour - time

The proportion of total payments made on time

Time frame
Measured at baseline and end of the study (6 months)
2

Product usage

The proportion of time solar home systems and mobile phones products are enabled

Time frame
Measured at baseline and end of the study (6 months)
3

Repayment behaviour - percentage revenue

Percentage of expected revenue collected by the solar home system provider within a six month time period

Time frame
Measured at baseline and end of the study (6 months)

Secondary outcomes

1

Vision related quality of life

Changes in perceived vision related quality of life assessed by questionnaire. Vision related quality of life will be assessed by 9 questions relating to how much difficulty the participant has in performing day to day tasks relating to their eyesight. Questions are answered on a scale from no difficulty at all to having to unable to perform the task due to eyesight issues.

Time frame
Measured at baseline and end of the study (6 months)
2

Income

Changes in self-reported income assessed by questionnaire. Participants will be asked how they generate an income and for each income source they will be asked how much they make per month from the income source (in KES).

Time frame
Measured at baseline and end of the study (6 months)
3

Livelihood

Changes in livelihood (source of income) assessed by questionnaire. Participants will be asked what there source of income is with the option to select multiple sources of income.

Time frame
Measured at baseline and end of the study (6 months)

Other outcomes

Locations

This trial has no locations.

Sponsors and contacts

Click on the lead sponsor to view all of their trials.

Dot Glasses Kenya

Lead sponsor

Queen's University, Belfast

Collaborator

University of Stellenbosch

Collaborator

Sun King

Collaborator

Livelihood Impact Fund

Collaborator

This trial is not recruiting at the moment. You can still explore other options: