Blurry vision — common causes and triage
Structured for Australian optometry practice.
Clinical decision support only
OptoGuide™ supports professional judgement and does not diagnose or replace clinician responsibility.
Quick answer
- Blurred vision should be split by monocular versus binocular, sudden versus gradual, and painful versus painless.
- Refractive change, dry eye, cataract, macular disease, glaucoma, optic nerve disease, and corneal pathology can all present with blur.
- Acuity, pinhole response, pupils, and fundus findings help narrow the site of pathology quickly.
- Refer urgently when blur is sudden, unexplained, associated with pain, distortion, field loss, or retinal / optic nerve signs.
Common causes
- Refractive error or uncorrected ametropia.
- Dry eye or tear film instability.
- Cataract or media opacity.
- Macular pathology including AMD or oedema.
- Optic nerve or retinal disease.
Red flags (must not miss)
- Sudden onset or rapid progression.
- Associated distortion, field loss, photopsia, or pain.
- RAPD, disc swelling, or retinal haemorrhage.
- Monocular blur not improving with pinhole.
- Reduced acuity out of proportion to the apparent surface findings.
Use OptoGuide™ to guide this decision during consult.
What to check
- Laterality, onset, variability, and whether pinhole helps.
- Acuity, refraction clue, and ocular surface quality.
- Pupils, confrontation fields, and motility if indicated.
- Anterior segment for cataract, cornea, or inflammation.
- Macula, nerve, and retina on dilated examination where needed.
When to refer
- Same day when blur is sudden or linked to retinal, optic nerve, or acute pressure-related signs.
- Routine referral when progressive pathology such as cataract or glaucoma requires shared care.
- Escalate when the cause cannot be explained by refractive or surface findings alone.
Initial management
- Identify whether the blur is optical, retinal, optic nerve, or neurological in pattern.
- Use pinhole and careful history to separate refractive fluctuation from disease.
- Document the acuity level and site of suspected pathology before referral.
Clinical basis
This guidance reflects standard optometric clinical reasoning based on:
- Australian optometry clinical practice patterns
- Australian medicines regulation and PBS prescribing context
- Common ophthalmology referral standards
- Evidence-based clinical training and practice
Use OptoGuide™ during consult for structured clinical guidance.