Telemedicine
A typical eye exam conducted by a qualified optometrist may help diagnose:
- Myopia and hyperopia
- Astigmatism
- Glaucoma
- Cataracts
- ...
An eye test typically covers item 1 above, with its main purpose being to assess visual acuity and determine the prescription lens power needed. However, the test result alone is not sufficient for obtaining new prescription glasses. Therefore, it is important to have an eye exam or eye test at least once a year.
Since myopia among young children has become a global concern, and the first sign of myopia is a decline in distant visual acuity, checking distant visual acuity is one of the few eye test procedures that can be performed by parents or general practitioners without specialized optometry equipment. Traditionally, a paper-based Snellen chart is hung on the wall under proper lighting conditions. However, the VAC app running on smartphones or tablets displays optically precise optotypes, unlike paper charts which may become distorted due to temperature, humidity, oxidation, and other factors.
Additionally, the recommended minimum luminance of 120 cd/m² for eye charts is almost guaranteed—provided the device screen is not deliberately dimmed. The app can also maintain its own brightness level independently of the device-wide settings.
Prerequisites
- Go to Settings > Record Scores
- Select your preferred notation, such as Fraction (20/40) or Decimal
Tests
After the initial consultation with your doctor, you may typically carry out a test every fortnight or month for yourself or your children, and save the records.Telemedicine
While you can certainly share the results with your doctor over a phone call, it may be more convenient to send them using various Internet applications on your smartphone or tablet.
Sharing Results
After selecting a patient (e.g., Peter Pan) from the Scores screen, press the Share button to export and share the results. You will see: 
All
The recipient will receive a plain description of the test results in SMS or Email body:
=================
Name: Peter Pan2023
Date: 2023-10-06
Chart: Snellen
Fraction - OS: 6/3.8 - 1; OD: 6/4.8 - 2
VAS - OS: 109; OD: 103
Date: 2023-09-25
Chart: Snellen
Fraction - OS: 6/4.8 - 1; OD: 6/6
VAS - OS: 104; OD: 100
Date: 2023-09-11
Chart: Snellen
Fraction - OS: 6/4.8; OD: 6/6 - 1
VAS - OS: 105; OD: 99
Date: 2023-08-28
Chart: Snellen
Fraction - OS: 6/4.8 - 1; OD: 6/6
VAS - OS: 104; OD: 100
=================
All to HTML file
A HTML file will be attached to a conversation in email apps, WhatsApp, Skype, or Microsoft Teams.
The presentation in the HTML file closely resembles what you see on the Scores screen, along with the raw test records. This allows the recipient to view the full picture of visual acuity progression.
All to JSON file
JSON is a widely used data exchange format between software applications.
If you, as a doctor, use patient record management software, you may ask the software vendor to integrate support for this JSON file—so you won’t need to manually input the data.
Selected Record
The recipient will receive a plain-text summary of the selected test result in the body of an SMS or email.