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See what's under the surface


Topographic indications of emerging keratoconus in teenage New Zealanders (2007)
Journal Article
Boyce, N. K., Bjornholdt, M. C., Gamble, G. D., Owens, H., Gamble, G. D., Bjornholdt, M. C., …Keung, L. (2007). Topographic indications of emerging keratoconus in teenage New Zealanders. Cornea, 26(3), 312-318. https://doi.org/10.1097/ICO.0b013e31802f8d87

PURPOSE: To screen a population of teenagers for emerging topographic signs of keratoconus (KC), with particular reference to ethnicity. METHODS: Corneal topography, visual acuity, and an environmental risk factor analysis were included in a screenin... Read More about Topographic indications of emerging keratoconus in teenage New Zealanders.

The Nepal longitudinal study: Biometric characteristics of developing eyes (2006)
Journal Article
Frith, M. J., Kinnear, R. F., Stewart, A. W., Garner, L. F., Garner, L. F., Stewart, A. W., …Frith, M. J. (2006). The Nepal longitudinal study: Biometric characteristics of developing eyes. Optometry and Vision Science, 83(5), 274-280. https://doi.org/10.1097/01.opx.0000215251.27409.16

PURPOSE. To identify differences in potential biometric markers for predicting refractive error in school children. METHODS. Biometric data on 895 Tibetan children, aged 6 to 18 years, residing in Katmandu, Nepal, were collected biennially from 1992... Read More about The Nepal longitudinal study: Biometric characteristics of developing eyes.

The relationship between the sagitta of the anterior corneal surface and refractive error of the eye (2004)
Journal Article
Garner, L. F., Garner, L. F., & Owens, H. (2004). The relationship between the sagitta of the anterior corneal surface and refractive error of the eye. Optometry and Vision Science, 81(8), 636-639. https://doi.org/10.1097/01.opx.0000141798.41340.8b

Changes in the sagitta of the anterior corneal surface associated with a change in the corneal radius of curvature have been used to calculate the change in refractive error of the eye in two areas: the ablation depth for laser surgery, and the chang... Read More about The relationship between the sagitta of the anterior corneal surface and refractive error of the eye.

Posterior corneal changes with orthokeratology (2004)
Journal Article
Owens, H., Garner, L. F., Craig, J. P., & Gamble, G. (2004). Posterior corneal changes with orthokeratology. Optometry and Vision Science, 81(6), 421-426. https://doi.org/10.1097/01.opx.0000135097.99877.5d

Purpose. To investigate changes in corneal thickness and the radius of curvature of the posterior corneal surface after orthokeratology (OK) rigid lens wear. Methods. Nineteen young myopic subjects wore reverse-geometry OK lenses (BE/ABE, Ultravision... Read More about Posterior corneal changes with orthokeratology.

A profile of keratoconus in New Zealand (2003)
Journal Article
Owens, H., & Gamble, G. (2003). A profile of keratoconus in New Zealand. Cornea, 22(2), 122-125. https://doi.org/10.1097/00003226-200303000-00008

Purpose. To examine the characteristics and risk factors for keratoconus in a New Zealand population. Methods. A one-page questionnaire was designed and sent to optometrists and ophthalmologists in New Zealand. Eye care practitioners then issued ques... Read More about A profile of keratoconus in New Zealand.

Accuracy of Orbscan II slit-scanning elevation topography (2002)
Journal Article
Collins, M. J., Cairns, G., McGhee, C. N., Collins, M. J., Owens, H., & Gamble, G. D. (2002). Accuracy of Orbscan II slit-scanning elevation topography. Journal of Cataract and Refractive Surgery, 28(12), 2181-2187. https://doi.org/10.1016/S0886-3350%2802%2901504-3

Purpose: To establish the accuracy of Orbscan II (Orbtek Inc.) slit-scanning elevation topography in analyzing the anterior surface of complex test objects. Setting: Discipline of Ophthalmology, University of Auckland, Faculty of Medical and Health S... Read More about Accuracy of Orbscan II slit-scanning elevation topography.

Effect of SoftPerm lens wear on corneal thickness and topography: A comparison between keratoconic and normal corneae (2002)
Journal Article
Owens, H., Watters, G., & Gamble, G. (2002). Effect of SoftPerm lens wear on corneal thickness and topography: A comparison between keratoconic and normal corneae. Clao Journal, 28(2), 83-87

Purpose. Complications related to contact lens-induced anoxia in the keratoconic eye are well documented, but the underlying mechanisms are poorly understood. This study compared topographical changes in corneal thickness and anterior corneal radius... Read More about Effect of SoftPerm lens wear on corneal thickness and topography: A comparison between keratoconic and normal corneae.

Tear spreading rates: Post-blink (2002)
Journal Article
Owens, H., & Phillips, J. R. (2002). Tear spreading rates: Post-blink. Advances in Experimental Medicine and Biology, 506, 1201-1204. https://doi.org/10.1007/978-1-4615-0717-8_170

The tear film plays a crucial role in the areas of contact lens wear and dry eye. However, despite its accessibility, there is no “gold-standard” test for assessing its functional quality. Current clinical tests are often poorly correlated with each... Read More about Tear spreading rates: Post-blink.

Spreading of the tears after a blink: Velocity and stabilization time in healthy eyes (2001)
Journal Article
Owens, H., & Phillips, J. (2001). Spreading of the tears after a blink: Velocity and stabilization time in healthy eyes. Cornea, 20(5), 484-487. https://doi.org/10.1097/00003226-200107000-00009

Purpose. To quantify the tear spreading velocity and stabilization time after blinks in healthy patients. Methods. Video recordings (magnification, ×130) were made of the movements of naturally occurring particles in the tear film while patients blin... Read More about Spreading of the tears after a blink: Velocity and stabilization time in healthy eyes.

Prevalence of myopia in Sherpa and Tibetan children in Nepal (1999)
Journal Article
Frith, M. J., Kinnear, R. F., Garner, L. F., Garner, L. F., Owens, H., Kinnear, R. F., & Frith, M. J. (1999). Prevalence of myopia in Sherpa and Tibetan children in Nepal. Optometry and Vision Science, 76(5), 282-285. https://doi.org/10.1097/00006324-199905000-00014

Background. Tibetan and Sherpa children living in Nepal share a common ancestry in Tibet and areas to the north of Nepal, but it is evident that these people experience widely contrasting educational and environmental conditions. The purpose of this... Read More about Prevalence of myopia in Sherpa and Tibetan children in Nepal.

Evaluation of mild, moderate, and advanced keratoconus using ultrasound pachometry and the eyesys videokeratoscope (1998)
Journal Article
WATTERS, G. A., & Owens, H. (1998). Evaluation of mild, moderate, and advanced keratoconus using ultrasound pachometry and the eyesys videokeratoscope. Optometry and Vision Science, 75(9), 640-646. https://doi.org/10.1097/00006324-199809000-00018

Background. The absolute accuracy of videokeratoscope (VKS) mapping of keratoconus is still in question, with contact lens-induced corneal warpage and chalazion having been shown to resemble this condition closely. Corneal thinning is investigated as... Read More about Evaluation of mild, moderate, and advanced keratoconus using ultrasound pachometry and the eyesys videokeratoscope.

Age dependence of ocular biometric measurements under cycloplegia with tropicamide and cyclopentolate (1998)
Journal Article
Owens, H., Garner, L. F., Yap, M. K., Frith, M. J., & Kinnear, R. F. (1998). Age dependence of ocular biometric measurements under cycloplegia with tropicamide and cyclopentolate. Clinical and Experimental Optometry, 81(4), 159-162. https://doi.org/10.1111/j.1444-0938.1998.tb06774.x

Background: Cyclopentolate continues to be the cycloplegic of choice for refracting young children, although many studies of ocular biometry promote the use of tropicamide. Methods: To clarify the role of drug type in biometric measurements, cyclople... Read More about Age dependence of ocular biometric measurements under cycloplegia with tropicamide and cyclopentolate.

Radius of curvature of the posterior surface of the cornea (1997)
Journal Article
Garner, L., Owens, H., Yap, M., Frith, M., & Kinnear, R. (1997). Radius of curvature of the posterior surface of the cornea. Optometry and Vision Science, 74(7), 496-498

The radius of curvature of the posterior surface of the cornea was measured in the vertical meridian for 120 children aged 6 to 17 years, using a Purkinje image method. The mean radius of curvature (+/-SD) was 6.42 +/- 0.31 mm, with a range from 5.62... Read More about Radius of curvature of the posterior surface of the cornea.

An evaluation of the keratoconic cornea using computerised corneal mapping and ultrasonic measurements of corneal thickness (1996)
Journal Article
Owens, H., & Watters, G. (1996). An evaluation of the keratoconic cornea using computerised corneal mapping and ultrasonic measurements of corneal thickness. Ophthalmic and Physiological Optics, 16(2), 115-123. https://doi.org/10.1046...75-1313.1996.95000178.x

Reports indicate the presence of up to three independent cone shapes in keratoconus (round/oval/global) but the preponderance of one cone over another is unclear. This work evaluates keratoconic corneal topography and corneal thickness using videoker... Read More about An evaluation of the keratoconic cornea using computerised corneal mapping and ultrasonic measurements of corneal thickness.

Keratoconus in monozygotic twins in New Zealand (1995)
Journal Article
Walters, G. A., Owens, H., & Watters, G. (1995). Keratoconus in monozygotic twins in New Zealand. Clinical and Experimental Optometry, 78(4), 125-129. https://doi.org/10.1111/j.1444-0938.1995.tb00805.x

We report on a case of keratoconus in identical twins who were brought up in Christchurch, New Zealand. Videokeratoscopy using an EyeSysa (EyeSys Laboratories, Houston, Texas, USA) revealed not only marked differences in severity of keratoconus betwe... Read More about Keratoconus in monozygotic twins in New Zealand.

Pharmacological effects on accommodative adaptation (1992)
Journal Article
Gilmartin, B., Bullimore, M., Rosenfield, M., Winn, B., & Owens, H. (1992). Pharmacological effects on accommodative adaptation. Optometry and Vision Science, 69(4), 276-284

We review the research which has attempted to determine whether the characteristics of autonomic innervation of ciliary smooth muscle are relevant to the process of accommodative adaptation. The effect of various topical autonomic drugs on the three... Read More about Pharmacological effects on accommodative adaptation.

Effect of a topical beta‐adrenergic receptor antagonist on the dynamics of steady‐state accommodation (1991)
Journal Article
Wrnn, B., Owens, H., Winn, B., Gilmartin, B., & Pugh, J. R. (1991). Effect of a topical beta‐adrenergic receptor antagonist on the dynamics of steady‐state accommodation. Ophthalmic and Physiological Optics, 11(2), 99-104. https://doi.org/10.1111/j.1475-1313.1991.tb00206.x

The ocular accommodation response to a stationary near target exhibits microfluctuations which arc characterized by two dominant components of activity: a low‐frequency component (LFC: < 0.5 Hz) and a high‐frequency component (HFC: 1.0–2.2 Hz). We ha... Read More about Effect of a topical beta‐adrenergic receptor antagonist on the dynamics of steady‐state accommodation.

The frequency characteristics of accommodative microfluctuations for central and peripheral zones of the human crystalline lens (1990)
Journal Article
Winn, B., Pugh, J., Gilmartin, B., & Owens, H. (1990). The frequency characteristics of accommodative microfluctuations for central and peripheral zones of the human crystalline lens. Vision Research,

Temporal variations in the nominally steady-state accommodation response can be characterized approximately by two principal regions of dominant activity: a low frequency region (LFR less than 0.6 Hz) and a high frequency region (HFR greater than 1.0... Read More about The frequency characteristics of accommodative microfluctuations for central and peripheral zones of the human crystalline lens.

Arterial pulse modulates steady-state ocular accommodation (1990)
Journal Article
Winn, B., Pugh, J. R., Gilmartin, B., & Owens, H. (1990). Arterial pulse modulates steady-state ocular accommodation. Current Eye Research, 9(10), 971-975. https://doi.org/10.3109/02713689009069933

Rapid and continuous fluctuations in ocular focus are known to occur when the eye views a stationary target. The advent of high-speed infra-red optometers has established that these microfluctuations of ocular accommodation have two dominant componen... Read More about Arterial pulse modulates steady-state ocular accommodation.

The effect of pupil size on static and dynamic measurements of accommodation using an infra-red optometer (1989)
Journal Article
Winn, B., Pugh, J., Gilmartin, B., & Owens, H. (1989). The effect of pupil size on static and dynamic measurements of accommodation using an infra-red optometer. Ophthalmic and Physiological Optics,

The study examines to what degree the output of the Canon Auto-ref R1 infra-red (IR) optometer is affected by variations in pupil size for both static measurement of refractive error and for continuous recording of accommodation when switched to its... Read More about The effect of pupil size on static and dynamic measurements of accommodation using an infra-red optometer.