What is an A-scan eye test used for?

An A-scan measures the axial length of the eyeball using ultrasound, used primarily for calculating the power of an intraocular lens (IOL) before cataract surgery. It can also assess tumours, vitreous hemorrhage, and globe trauma. Modern clinics often substitute optical biometry (IOL Master or Lenstar) which is non-contact and more accurate for typical cataract planning.

A-Scan Eye Test Cost in 2026: $100-$300

Q: How much does an A-scan eye test cost in 2026?

A-scan ultrasound biometry costs $100-$300 in 2026 without insurance. It is typically performed before cataract surgery to measure the axial length of the eye for IOL (intraocular lens) power calculation. Medicare Part B and most medical insurance plans cover the test when ordered as part of cataract surgery planning.

Q: What is the difference between A-scan and IOL Master?

A-scan uses ultrasound and requires a probe to touch the cornea (with anaesthetic drops). IOL Master and Lenstar use partial coherence interferometry (light-based, non-contact). Optical biometry is faster, more comfortable, and generally more precise for routine cataract planning. A-scan remains useful when dense cataracts prevent light penetration.

Q: Is the A-scan covered by Medicare?

Yes when medically necessary. Medicare Part B covers diagnostic ultrasound biometry including A-scan when it is required for cataract surgery planning, evaluation of suspected intraocular tumour, or other documented medical indication. Deductible and 20% coinsurance apply.

The A-scan is an ultrasound measurement of axial eye length, used primarily to calculate the correct intraocular lens (IOL) power before cataract surgery. Out of pocket it runs $100-$300; Medicare Part B and most medical insurance cover it when ordered for cataract planning. Modern clinics typically use optical biometry (IOL Master) instead, which is non-contact and more precise for most patients.

A-Scan Pricing (2026)

Service	Typical 2026 Cost	Notes
A-scan ultrasound biometry (no insurance)	$100 - $300	Pre-cataract surgery IOL planning
A-scan with Medicare Part B	Covered + 20% coinsurance	After deductible
IOL Master (optical biometry, modern alt)	$100 - $250	Non-contact, more accurate for most
Combined A-scan + B-scan ultrasound	$200 - $450	When dense cataract requires both
Cataract surgery total (one eye, no insurance)	$3,500 - $7,000	Includes A-scan, surgery, IOL, follow-up

A-Scan vs IOL Master (Optical Biometry)

A-Scan (ultrasound)

Probe contacts the cornea with anaesthetic drops. Useful when dense cataracts prevent light penetration. Older technology but still used clinically.

IOL Master / Lenstar (optical)

Non-contact, uses partial coherence interferometry. Faster, more comfortable, generally more accurate for routine cataract planning.

FAQ

How much does an A-scan eye test cost in 2026?

$100-$300 without insurance; covered by Medicare Part B and most medical plans when medically necessary (typically cataract surgery planning).

What is an A-scan used for?

Measures axial eye length for IOL power calculation before cataract surgery. Also used for tumour evaluation, vitreous hemorrhage, and trauma assessment.

What is the difference between A-scan and IOL Master?

A-scan uses contact ultrasound; IOL Master uses non-contact light-based biometry. Optical biometry is faster and generally more accurate for typical cataract planning.

Is the A-scan covered by Medicare?

Yes when medically necessary (cataract surgery planning, tumour evaluation, trauma). Deductible and 20% coinsurance apply.

Do I need an A-scan before LASIK?

No. LASIK requires corneal topography and pachymetry, not axial length biometry. A-scan is specifically for IOL calculation in cataract or refractive lens exchange surgery.

Sources

This page is informational, not medical advice. Discuss biometry options with your cataract surgeon.