The Optical Clinic Refraction Workflow: From Autorefraction to Final Prescription

Why a Standardised Refraction Workflow Matters

Inconsistent refraction technique is the most common source of patient dissatisfaction in optical clinics ("my new glasses aren't right"). A documented, reproducible workflow protects the clinician and produces better outcomes.

Step 1: Autorefraction

Begin with an automated refractometer measurement with the patient fixating on a distant target. Record sphere (SPH), cylinder (CYL), and axis for each eye. Note the confidence index if the device provides one. Important: autorefraction is a starting point, not a final prescription. It is particularly unreliable in:

• High astigmatism (CYL > 3.00 D).

• Keratoconus or irregular corneas.

• Dense nuclear cataracts.

• Young children (cycloplegic refraction required — see below).

Step 2: Uncorrected and Corrected Visual Acuity

Record unaided distance and near VA for each eye using a standard LogMAR or Snellen chart. If the patient wears current correction, record entering VA (with glasses/contacts) and then unaided. This establishes the baseline before trial lens refinement.

Step 3: Objective Refraction Refinement (Retinoscopy)

For patients where autorefraction is unreliable, streak retinoscopy provides a more accurate objective starting point. The working distance neutralisation formula: subtract the working distance (in dioptres) from the apparent sphere. For children under 12, cycloplegic refraction using cyclopentolate 1% (instilled twice, 5 minutes apart, examination after 30 minutes) is mandatory to eliminate accommodative influence.

Step 4: Subjective Refraction

Start with the autorefraction or retinoscopy result in the trial frame or phoropter. Sphere refinement: Use the Duochrome (red-green) test or fogging technique to achieve maximum plus for maximum visual acuity (MPMVA). Cylinder refinement: Cross-cylinder technique to refine axis and power. Confirm with Jackson cross-cylinder. Final sphere refinement: Remove fog to arrive at the final monocular Rx.

Step 5: Binocular Balancing

After achieving best monocular Rx for each eye, balance the accommodative effort between the two eyes using the alternating occlusion method or the Humphriss immediate contrast (HIC) method. If significant anisometropia is found (> 1.50 D difference between eyes), consider the patient's tolerance to avoid adaptation problems with spectacles.

Step 6: Near Addition (for Presbyopia)

For patients aged ≥ 40 or those with symptoms of near blur, determine the near addition:

• Start with the age-expected add (guide: +1.00 D at 40, +2.00 D at 50, +2.50 D at 55).

• Refine using a near test chart at the patient's habitual working distance.

• Record NVA achieved with the add.

Recording the Final Prescription

A complete optical Rx documents:

• SPH, CYL, Axis for distance (R and L)

• Add power (if presbyopic)

• Near VA and distance VA with Rx

• PD (pupillary distance) — monocular and binocular

• Prism (if prescribed)

• Notes on frame style limitations (e.g., high power requiring small frame)

Documenting in ClinIT

ClinIT's optical note template contains structured grids for all the above fields. The near and distance Rx auto-populates the printable lens prescription card, which includes the clinic's letterhead and is available to the patient as a PDF from their portal.