Optical Module

Eye examinations

Each eye exam records both eyes independently:

Visual Acuity (unaided and aided) — LogMAR or Snellen

Subjective Refraction — Sphere, Cylinder, Axis, Add

Intraocular Pressure — applanation or non-contact

Pupil Distance — monocular and binocular

Colour Vision — Ishihara plates

Cover Test — Orthophoria / Exo / Esotropia

Slit Lamp Findings — free text and structured fields

Fundus Findings — free text

Impression and Plan — structured SOAP

Spectacle prescriptions are auto-formatted and can be printed or sent as a PDF via WhatsApp.

IOL calculator

The built-in IOL power calculator supports five formulae simultaneously:

Barrett Universal II — recommended for most eyes, requires WTW

SRK/T — classic formula, best for long axial lengths (above 26mm)

Haigis — requires personalised a0, a1, a2 constants; best for post-refractive eyes

Holladay 1 — reliable for medium axial lengths

Hoffer Q — best for short eyes (below 22mm)

Entering biometry:

1. Patient Profile > Eye Exam > IOL Calculator.
2. Select the eye (Right / Left / Both).
3. Enter: Axial Length, K1 and K2 (diopters and axis), ACD, WTW, CCT (optional).
4. Select the formulae to compare.
5. Choose the target IOL and click Select Lens — stored to the patient record.

Surgeon constants: configure personalised A-constants and pACD values per IOL model in Settings > IOL Constants.

Refraction history and myopia management

The Rx Timeline tab plots historical refractions as a trend:

• Spherical Equivalent (SE) over time
• Axial Length (AL) growth rate
• Myopia progression flag triggered when SE change exceeds 0.50D per 6 months or AL growth exceeds 0.2mm per 6 months

Myopia management protocols:

For patients enrolled in a myopia control programme, set the protocol (Atropine 0.01%, Ortho-K, MiSight, DIMS lenses) and record compliance at each visit. Progress is tracked against COMET and ATOM2 benchmarks.