What is the pinhole test and why does every GP need it?

A pinhole occluder (or improvised cardboard hole 1–2 mm diameter) eliminates the effect of refractive error by allowing only the central ray to reach the retina. If reduced vision improves to near-normal through the pinhole, the cause is refractive — glasses and optometry referral will fix it. If vision does not improve, the cause is structural eye pathology — cataract, macular degeneration, optic nerve disease, or retinal disease — requiring ophthalmology or urgent referral. It costs nothing and takes 30 seconds.

My child's school report says their reading is falling behind. Could their eyes be the reason?

Absolutely — uncorrected refractive error is one of the commonest causes of reduced school performance, particularly in children who cannot clearly see a board or computer screen. Children rarely complain about blurred vision because they have nothing to compare it to. Signs suggesting uncorrected refractive error include squinting, sitting close to screens, headaches after school, eye rubbing, or avoidance of reading and sport. A routine optometry appointment — Medicare-rebated, no GP referral needed — is the first step.

What can slow down my child's worsening short-sightedness?

Three interventions have the strongest trial evidence. Outdoor time of at least two hours per day is free, consistently reduces myopia progression by around 25–30%, and should be the first recommendation for any myopic child. Defocus-incorporated spectacles (brand names include MiYOSMART and Stellest, available in Australia since 2022) slow axial elongation by around 50% in randomised trials. Low-dose atropine eye drops 0.01–0.05% nightly, prescribed by a paediatric ophthalmologist or specialist optometrist via compounding pharmacy, add a further 30–70% slowing effect. These can be combined for progressive cases.

Is LASIK eye surgery covered by Medicare in Australia?

No — laser refractive surgery (LASIK, SMILE, PRK) is not Medicare-rebatable when performed for refractive correction alone. Private cost is approximately $2,000–4,000 per eye. Rare exceptions include medically indicated cases such as severe keratoconus, extreme anisometropia, or post-corneal-transplant correction, where a limited Medicare rebate may apply under specialist-led care. Cataract surgery with lens implant is Medicare-rebated when cataract is the primary indication.

What is presbyopia and why does it happen to everyone?

Presbyopia is the universal age-related loss of near-focusing ability that begins around age 40–45 and is complete by the mid-50s. The crystalline lens stiffens progressively and the ciliary muscle weakens, so the eye can no longer zoom in for near vision. Reading glasses, bifocals, or progressive (varifocal) lenses restore near vision. Multifocal contact lenses and monovision correction (one eye for distance, one for near) are alternatives. Presbyopia-correcting intraocular lenses at the time of cataract surgery offer a surgical option in older patients.

Refractive errors and presbyopia

Refractive errors and presbyopia: the AU general practice guide

By Dr HB Lo, FACRRM Reviewed 2 October 2026 11 min read

Refractive errors — myopia, hyperopia, astigmatism, and presbyopia — are the commonest cause of correctable vision impairment globally and extremely prevalent in AU general practice.

The pinhole test is the most useful general-practice discriminator: vision improving through a pinhole is refractive; vision that does not suggests ocular pathology needing referral. Routine optometry is Medicare-rebatable, no GP referral needed.

Childhood myopia has public-health urgency: prevalence is projected to reach 50% by 2050. Evidence-based myopia control options include outdoor time ≥2 h/day, low-dose atropine 0.01–0.05%, and MiYOSMART defocus spectacles.

Refractive errors are the single most common cause of correctable vision impairment worldwide. In Australian general practice they present as a child squinting at the classroom board, a patient in their 40s holding menus at arm’s length, or a middle-aged adult making an appointment for “blurry eyes” — frequently manageable with an optometry referral that requires no GP letter and is Medicare-rebated.

A. Core clinical — the AU general-practice framework

The four entities

Myopia (short-sightedness) — the image falls in front of the retina because the eyeball is too long (axial myopia, axial length >24 mm) or because optical power is excessive. Distant objects are blurred; near vision is preserved. Severity: low (−0.5 to −3.0 D), moderate (−3.25 to −6.0 D), high/pathological (>−6.0 D). High myopia carries substantially increased lifetime risk of retinal detachment, myopic maculopathy, glaucoma, and cataract.

Hyperopia (long-sightedness) — image falls behind the retina; the eye is too short or converging power is insufficient. Near blur predominates, though strong accommodation in children can fully compensate and leave the condition latent until eye strain, school difficulties, or convergence demands reveal it. High hyperopia (>+5.0 D) is associated with shallow anterior chamber — a risk factor for primary angle-closure glaucoma.

Astigmatism — uneven corneal or lenticular curvature focuses light at multiple points rather than one, causing blur and ghosting at all distances. Regular astigmatism is correctable with cylindrical lenses. New or rapidly worsening astigmatism in an adolescent or young adult requires corneal topography to exclude keratoconus.

Presbyopia — universal age-related loss of accommodative amplitude from approximately age 40–45. The crystalline lens stiffens and ciliary muscle weakens, eliminating near-focus ability. Fully established by the mid-50s. Often unmasked earlier in hyperopic eyes already using accommodation for distance vision.

Anisometropia — a difference in refractive error of ≥1.0 D between the two eyes. In children younger than 7–8 years this is an urgent amblyopia risk — refer to optometry or ophthalmology promptly (see also strabismus and amblyopia).

History

Key symptom questions: distant blur (driving, classroom board) suggests myopia; near blur (reading, phone held at arm’s length) suggests presbyopia or hyperopia; blur at both distances with ghosting suggests astigmatism. Eye strain, frontal headache, squinting, and frequent eye rubbing are common presentations of uncorrected refractive error across all types.

In children: reduced school performance, sitting close to screens, avoidance of reading or ball sports, and complaints of headache after school are important red flags. In adults: headaches worsening with sustained near work, difficulty reading in dim light, and glare with night driving deserve assessment.

Risk factors for childhood myopia include both parents myopic, urban living, less than two hours outdoor time daily, and East Asian ethnicity. Keratoconus risk factors include atopic disease, vigorous eye rubbing, connective tissue disorders (Marfan, Ehlers-Danlos), and Down syndrome.

Examination

The single most useful general-practice eye test is the pinhole test: improvement in visual acuity through a 1–2 mm pinhole confirms a refractive cause — the central ray bypasses the optical error. Failure to improve through the pinhole points to structural eye pathology requiring further investigation or specialist referral. Measure Snellen distance acuity at 6 metres and near acuity at 40 cm — first with current correction, then without, then pinhole.

Additional examination: confrontation visual fields; pupil responses including relative afferent pupillary defect; red reflex for symmetry, opacities, and leukocoria in children; direct ophthalmoscopy for optic disc and macula; cover test and Hirschberg corneal light reflex for strabismus in children.

Investigations

The first-line investigation is referral to optometry for autorefraction and subjective refraction — Medicare-rebated under item 10900 (initial comprehensive consultation) or 10907 (subsequent) without a GP referral letter. Paediatric assessment requires cycloplegic refraction (cyclopentolate or atropine dilation) to unmask latent hyperopia and detect accommodative esotropia.

Investigate acutely if there is rapid refractive change in an adult: HbA1c and fasting glucose to exclude osmotic hyperglycaemic shift (defer new prescription until glycaemia stable for at least 8–12 weeks). For suspected keratoconus, corneal topography and tomography (Pentacam) are performed by an optometrist or ophthalmologist.

Common clinical pitfalls

Never dismiss persistent visual blur as refractive without performing the pinhole test — pathology mimics refractive error.
New astigmatism in a young adult is corneal pathology until corneal topography confirms otherwise.
Latent hyperopia in a school-age child will not be detected by standard autorefraction — cycloplegic refraction is needed.
Rapid refractive change in an adult with diabetes reflects glycaemic instability, not new primary refractive error — prescribe glasses only once the HbA1c is stable.

B. Evidence — paediatric myopia control

Why it matters

Global myopia prevalence is projected to reach 50% of the world population by 2050, with substantial associated blindness from pathological myopia. In Australia, childhood myopia prevalence has historically been lower than East Asia due to outdoor lifestyle, but is rising — particularly in urban areas and following school closures during the COVID-19 pandemic. Each dioptre of myopia increases lifetime retinal detachment risk; halting axial elongation in childhood, not merely correcting blur, is the treatment objective.

The myopia control toolkit

Outdoor time ≥2 hours/day — ROHTO RCT (Wu et al. Ophthalmology 2018) demonstrated a 25–30% reduction in myopia progression with structured outdoor programmes. Light-driven retinal dopamine release slows axial elongation. This is free, has no adverse effects (use a hat and UV-protective sunglasses), and should be the explicit first recommendation to every myopic child and their family.

Defocus-incorporated spectacles (DIMS / MiYOSMART, Stellest) — the DIMS randomised controlled trial (Lam et al. BJO 2020) demonstrated approximately 60% slower progression and 52% slower axial elongation over two years compared with single-vision lenses. Available in Australia since 2022. Private cost approximately $300–500 per pair; not PBS-subsidised. These should replace single-vision lenses in progressing myopic children wherever affordable.

Low-dose atropine 0.01–0.05% nightly — LAMP study (Yam et al. Ophthalmology 2019) and 3-year follow-up (Wei et al. Lancet 2023) established a dose-response: 0.05% provides approximately 67% myopia control, 0.025% intermediate, 0.01% approximately 30% with fewer adverse effects and less rebound on cessation. Not PBS-listed — compounded via prescription, approximately $30–50 per month. Prescribed by paediatric ophthalmologist or specialist optometrist. Combining atropine with DIMS spectacles produces additive slowing in rapidly progressing cases.

Multifocal soft contact lenses (MiSight, MyDay) — BLINK study (Walline et al. JAMA 2020) showed approximately 25% slower progression with daily-disposable multifocal lenses. Suitable for motivated children with good hygiene. Risk of microbial keratitis is low with daily disposables.

Orthokeratology — overnight rigid lenses reshape the cornea producing peripheral myopic defocus. Control effect approximately 30–50%. Prescribed by specialist optometrists. Acanthamoeba keratitis risk if water exposure occurs — strict hygiene essential.

What does not work for myopia control: single-vision spectacles correct blur but have no control effect. Progressive or bifocal lenses have minimal evidence. Blue-light blocking spectacles — a 2023 Cochrane review found no benefit for eye strain, sleep, or refractive progression; do not recommend despite heavy marketing. “Bates method” eye exercises have no mechanistic basis and no trial support.

C. Adult refractive correction

Spectacles remain the safest, most accessible correction for all refractive errors. Photochromic lenses (transition) are suitable for light-sensitive patients. Anti-reflective coating reduces night-driving glare. Multifocal (progressive) spectacles are the commonest current option for presbyopia; bifocal lenses with a visible line are less popular cosmetically.

Contact lenses: soft daily disposable lenses have the lowest microbial keratitis risk. Monthly lenses are cost-effective with strict hygiene. Never wear contact lenses swimming or showering — Acanthamoeba keratitis is sight-threatening. Rigid gas-permeable and scleral lenses suit irregular corneas (keratoconus, post-LASIK ectasia).

Refractive surgery options for appropriately selected adults:

LASIK (femtosecond flap + excimer ablation) — rapid recovery; suits low-moderate myopia and astigmatism; dry eye in 20–30% transiently.
PRK/LASEK (surface ablation, no flap) — slower recovery; preferred for thin corneas and contact sports.
SMILE — femtosecond-only, smaller incision, less dry eye than LASIK; suits moderate-high myopia.
ICL (implantable collamer lens) — phakic intraocular lens; reversible; suits high myopia where laser surgery is unsafe; carries intraocular surgery risks including endophthalmitis.
Refractive lens exchange — essentially cataract surgery before cataract develops; suits presbyopic patients with high refractive error.

Refractive surgery is not Medicare-rebatable except in medically indicated cases (keratoconus, severe anisometropia, post-corneal transplant). Private cost approximately $2,000–4,000 per eye. Eligibility requires stable refraction (no change >0.5 D in 12 months), normal corneal topography, adequate corneal thickness, age ≥21, absence of active dry eye or autoimmune disease, and no pregnancy.

Presbyopia options in adults: reading glasses from approximately +1.0 D (OTC pharmacy is reasonable for symmetric emmetropes); prescription progressives for those with astigmatism, anisometropia, or higher correction needs; multifocal contact lenses; monovision contact lenses (trial before committing to surgical monovision). Pilocarpine 1.25% drops (brand name VUITY, FDA-approved USA 2021) are not TGA-approved in Australia and should not be routinely recommended.

D. Australian operations

MBS pathways

GP consultations — item 23 (Level B), 36 (Level C), 44 (Level D) for assessment, advice, referral coordination, and myopia control discussions with families.

Optometry — item 10900 (comprehensive initial consultation, every 3 years generally) and 10907 (subsequent review) are Medicare-rebated with no GP referral required. Annual rebated optometry is available under specific indications: age >65, diabetes (KeepSight programme), glaucoma family history, or progressive refractive condition.

ATSI Health Assessment (item 715) and 75+ Health Assessment (item 707) both include vision screening — document findings for community health planning.

Ophthalmology — item 104 (initial) and 105 (subsequent) are Medicare-rebated when a referral letter from a GP or optometrist is provided. Indications: pathological myopia >−6.0 D, keratoconus, paediatric amblyopia or strabismus, cataract assessment, refractive surgery evaluation, diabetic eye disease, or suspected angle-closure glaucoma.

Refractive surgery and elective lens exchange — not Medicare-rebatable for refractive indications; private cost ~$2,000–4,000 per eye. Cataract surgery (item 42702) is rebated when cataract is the primary indication.

GP chronic disease management (items 965/967) applies only where refractive error is part of a broader chronic condition (e.g., pathological myopia + diabetic retinopathy, or keratoconus-related visual impairment with mental health impact).

PBS prescribing notes

Low-dose atropine 0.01–0.05% for paediatric myopia control is not PBS-listed — compounding pharmacy, private prescription, approximately $30–50 per month. Cyclopentolate 1% eye drops for diagnostic cycloplegic refraction are PBS general benefit. Pilocarpine 2–4% for glaucoma is PBS general benefit (different indication from presbyopia). Tropicamide for diagnostic mydriasis is generally OTC.

Medico-legal considerations

Driving licence visual acuity standards (Austroads): private licence requires best corrected visual acuity (BCVA) ≥6/12 in the better eye and binocular visual field ≥120°. Commercial vehicle standards are stricter. GPs and optometrists in some Australian jurisdictions have mandatory reporting obligations if a patient continues to drive below the required standard. Document fitness-to-drive discussions in notes.

Refractive surgery consent requires explicit documentation of realistic expectations: residual error, possible dry eye, halos and starbursts, the inevitability of presbyopia in time, and regression risk particularly for hyperopic corrections.

E. Special populations

Children (paediatric myopia) — this is the priority group. Every progressing myopic child younger than 15 deserves an explicit conversation about myopia control options. Refer to optometry with paediatric myopia management capability, or to a paediatric ophthalmologist for rapid progressors (>−1.0 D/year). Prescribing single-vision spectacles alone in a rapidly progressing child is no longer best practice.

People with diabetes — hyperglycaemia causes osmotic lens swelling and transient refractive shifts (typically myopic). Do not prescribe new glasses during a hyperglycaemic episode — recheck refraction when HbA1c has been stable for at least 8–12 weeks. Annual KeepSight optometry is separately important for diabetic retinopathy screening.

Older adults — presbyopia affects everyone; the onset is often emotionally significant. Reading glasses are not a sign of ageing prematurely. Falls risk from progressive spectacle lens adaptation is real — advise patients taking one to two weeks to adapt, to be cautious on stairs during that period.

ATSI and rural/remote communities — refractive error is disproportionately undetected and under-corrected in these groups due to access barriers. Vision 2020 Australia outreach programmes and state concession spectacle schemes (e.g., Victorian Eyecare Service, NSW Spectacles Program) provide subsidised access. DVA Gold and White Cards fund full vision care including spectacles for eligible veterans.

Drivers and pilots — occupational vision standards apply. Refer to Austroads fitness to drive guidance for private drivers; aviation, maritime, and rail standards are occupation-specific. Document discussion if a patient does not meet standards.

When to escalate

Refer urgently (same day, via emergency department if needed):

Sudden vision loss, flashes, floaters, or curtain over the visual field — vision-loss workup and urgent ophthalmology.
Acute angle-closure — headache, nausea, halos around lights, mid-dilated non-reactive pupil, hard eye.
Chemical eye injury or penetrating eye trauma.

Refer semi-urgently (within 1–4 weeks):

Paediatric anisometropia ≥1.0 D or suspected strabismus/amblyopia — paediatric optometry or ophthalmology before the amblyogenic window closes.
Rapidly worsening astigmatism in a young adult — corneal topography and keratoconus screen.
Paediatric myopia progressing faster than −1.0 D/year — myopia management optometry or paediatric ophthalmology.

Refer routinely:

Any new visual symptom not fully explained by refractive error on pinhole test — ophthalmology.
Refractive surgery assessment — ophthalmology.
Pathological myopia >−6.0 D — annual dilated ophthalmology review for retinal complications.

Consumer resources: HealthDirect — Refractive errors · Good Vision for Life · RANZCO patient information · Vision Australia.

What this article is and is not

This is general health information synthesised from current Australian guidelines — Therapeutic Guidelines (eTG), RANZCO position statements, Optometry Australia, International Myopia Institute clinical white papers, and HealthDirect. It is not personal medical advice and does not create a doctor–patient relationship. Specific prescribing decisions — glasses, contact lenses, myopia control agents, refractive surgery — are made with a registered optometrist or ophthalmologist who can examine your eyes directly.

Sources cited

Frequently asked questions

What is the pinhole test and why does every GP need it?

A pinhole occluder (or improvised cardboard hole 1–2 mm diameter) eliminates the effect of refractive error by allowing only the central ray to reach the retina. If reduced vision improves to near-normal through the pinhole, the cause is refractive — glasses and optometry referral will fix it. If vision does not improve, the cause is structural eye pathology — cataract, macular degeneration, optic nerve disease, or retinal disease — requiring ophthalmology or urgent referral. It costs nothing and takes 30 seconds.
My child's school report says their reading is falling behind. Could their eyes be the reason?

Absolutely — uncorrected refractive error is one of the commonest causes of reduced school performance, particularly in children who cannot clearly see a board or computer screen. Children rarely complain about blurred vision because they have nothing to compare it to. Signs suggesting uncorrected refractive error include squinting, sitting close to screens, headaches after school, eye rubbing, or avoidance of reading and sport. A routine optometry appointment — Medicare-rebated, no GP referral needed — is the first step.
What can slow down my child's worsening short-sightedness?

Three interventions have the strongest trial evidence. Outdoor time of at least two hours per day is free, consistently reduces myopia progression by around 25–30%, and should be the first recommendation for any myopic child. Defocus-incorporated spectacles (brand names include MiYOSMART and Stellest, available in Australia since 2022) slow axial elongation by around 50% in randomised trials. Low-dose atropine eye drops 0.01–0.05% nightly, prescribed by a paediatric ophthalmologist or specialist optometrist via compounding pharmacy, add a further 30–70% slowing effect. These can be combined for progressive cases.
Is LASIK eye surgery covered by Medicare in Australia?

No — laser refractive surgery (LASIK, SMILE, PRK) is not Medicare-rebatable when performed for refractive correction alone. Private cost is approximately $2,000–4,000 per eye. Rare exceptions include medically indicated cases such as severe keratoconus, extreme anisometropia, or post-corneal-transplant correction, where a limited Medicare rebate may apply under specialist-led care. Cataract surgery with lens implant is Medicare-rebated when cataract is the primary indication.
What is presbyopia and why does it happen to everyone?

Presbyopia is the universal age-related loss of near-focusing ability that begins around age 40–45 and is complete by the mid-50s. The crystalline lens stiffens progressively and the ciliary muscle weakens, so the eye can no longer zoom in for near vision. Reading glasses, bifocals, or progressive (varifocal) lenses restore near vision. Multifocal contact lenses and monovision correction (one eye for distance, one for near) are alternatives. Presbyopia-correcting intraocular lenses at the time of cataract surgery offer a surgical option in older patients.

Source quality

Sources grouped by evidence tier. AU primary tier first; international where AU is silent or lagging; named-author reconstruction where guidelines have not yet caught up. How tiers work.