Wavefront Aberrometry

Published on
December 4, 2023
Related articles

Wavefront Aberrometry

Innovative Eye Care’s Wakefield Street practice was the first Optometry practice in the world to own a Pentacam AXL Wave. One of the incredible uses of this piece of equipment is wavefront aberrometry. The Pentacam AXL Wave’s wavefront aberrometry revolutionises the management of hyperopia, myopia, astigmatism, keratoconus, and contact lens design.

What is wavefront aberrometry?

Our eyes are not perfect optical systems, as biological tissue, so everyone has some degree of aberration. Optical aberration is the deviation of a single ray of light from a point of focus.1 Wavefront aberrometry measures many rays of light to create a collective wavefront. The wavefront can then be broken down mathematically into a series of known orders of shape into what is known as a Zernike polynomial.2

The wavefront shapes are commonly simple, such as a sphere or cylinder. These simple shapes are known as lower-order aberrations and are easily corrected by spectacles and contact lenses.1 However, it’s the less common wavefront shapes that make up higher-order aberrations, such as coma and trefoil. Higher-order aberrations are responsible for common visual symptoms like glare, haloes, poor night vision and doubling.3 They are more severe in conditions like keratoconus, pterygium, and corneal graft, and cannot be totally improved with conventional opticalcorrection.4,5

Lower-order aberrations (defocus and astigmatism) and higher-order aberrations (coma)forming the total wavefront.

How does wavefront aberrometry work?

A Hartmann-Shack wavefront sensor detects the deviation of light at hundred of points through the pupil.2 Coupled with this measurement of the total eye aberration, the Pentacam AXL Wave also uses Scheimpflug imaging to measure the shape of the front and back surface of the cornea. Both total eye aberration and corneal tomography combined can identify the source of aberration as either corneal or internal.

Visual performance of a patient’s optical system (eye) based on aberrometry readings, divided into corneal and internal components.

How can aberrometry benefit me?

Now that Innovative Eye Care is armed with the Pentacam AXL Wave, we can completely individualise the management of our patients. The ultimate aim is to correct all aberrations, creating a perfect optical system for a singular point of focus. In conditions such as keratoconus, which are known to cause large amounts of higher-order aberration, we can now measure and correct these aberrations with wavefront-guided scleral contact lenses. Furthermore, in some cases we can utilise aberrations to create a multifocal effect (multiple points of focus), or even control myopia progression in children (peripheral retinal focus confusion).6

References

1) Maeda, N., 2009. “Clinical applications of wavefront aberrometry - a review.” Clinical and Experimental Ophthalmology,37(1): pp.118-129.

2) Salés, C. and E. Manche (2015). “Comparison of ocular aberrations measured by a Fourier-based Hartmann-Shack and Zernike-based Tscherning aberrometer before and after laser in Situ keratomileusis.” J Cataract Refract Surg 41(1): 1820-1825.

3) Ohlendorf, A., et al., 2020. “Advancing Digital Workflows for Refractive Error Measurements.” Journal of Clinical Medicine, 9(1): pp.2205.

4) Jinabhai, A. (2019). “Custominsedaberration-controlling corrections for keratoconic patients using contact lenses.” Clin Exp Optom 103(1): 31-43.

5) Kumar, P., et al. (2019). “Do visual performance and optical quality vary across different contact lens correction modalities in keratoconus?” Contact Lens and Anterior Eye, S1367-0484(20):30052-30057.

6) Hoy, L., 2019. “Demystifying Corneal Reshaping With Ortho-K.” Lecture for CCLSA Victoria.



Related articles

Lorem ipsum dolor sit amet, consectetur adipiscing elit.

View all
Advanced Imaging
4 min read

Visual Field Testing

Automated full-threshold visual field testing is an important assessment your...
Read more
Advanced Imaging
7 min read

Wavefront Aberrometry

Innovative Eye Care’s Wakefield Street practice was the first Optometry practice in...
Read more
Advanced Imaging
5 min read

Retinal Imaging

At Innovative Eye Care, your optometrist will take photographs of the...
Read more
Advanced Imaging
5 min read

Optical Coherance Tomography Angiography (OCT-A)

Optical coherence tomography angiography (OCT-A) is a non-invasive scan that ...
Read more
Advanced Imaging
8 min read

Optical and Ultrasound Biometry

An ocular biometer measures the size and shape of the eye, specifically axial...
Read more
Advanced Imaging
6 min read

Optical Coherence Tomography (OCT)

Optical coherence tomography (OCT) is a non-contact, non-invasive technique t...
Read more
Advanced Imaging
3 min read

Fundus Autofluoresence

Fundus autofluorescence (FAF) is a non-invasive, high-definition scan...
Read more
Advanced Imaging
6 min read

Corneal Topography

Integral to our Adelaide and Henley Beach practices so heavily involved with ...
Read more
Advanced Imaging
5 min read

Corneal Tomography

The Pentacam AXL Wave is the latest addition to Innovative Eye Care’s arsenal...
Read more
Advanced Imaging
4 min read

Anterior Ocular Imaging

Anterior imaging (imaging of the front of the eye) is vital for detecting and...
Read more
View all

Speak to our friendly team today

Book your appointment now for personalised eye care tailored just for you.

Middle aged man using VR headset

Follow us on Instagram and Facebook to see what we’ve been up to!

Stay In Sight

Sign up to our newsletter for the latest in eye care, exclusive offers, and a peek into the future of eyewear.

By clicking Sign Up you're confirming that you agree with our Terms and Conditions.
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.