Ophthalmic and Physiological Optics Ophthalmic and Physiological Optics RSS feedThis is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

A proposed minimum data set for international primary care optometry: a modified Delphi study
ConclusionsThis minimum data set should be easily integrated into clinical practice yet allow vital data to be collected internationally from primary care optometry. It should not be mistaken for a clinical guideline and should not add workload to the optometrist. A pilot study incorporating an additional Delphi stage prior to implementation is advisable to refine some response categories. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - May 1, 2017 Category: Opthalmology Authors: Christopher J. Davey, Sarah V. Slade, Darren Shickle Tags: Original Article Source Type: research

Using perimetric data to estimate ganglion cell loss for detecting progression of glaucoma: a comparison of models
ConclusionsTwo very different approaches for testing the hypothesis both gave a negative result. For all seven ganglion cell models, rates of ganglion cell loss were highly affected by fluctuations in height of the hill of vision. Methods for reducing effects of between‐visit variability are needed in order to assess progression by relating perimetric sensitivities and ganglion cell numbers. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - April 25, 2017 Category: Opthalmology Authors: Derek A. Price, William H. Swanson, Douglas G. Horner Tags: Original Article Source Type: research

Scattering contribution to the double ‐pass PSF using Monte Carlo simulations
ConclusionThe spatial contribution of light diffused in the ocular fundus to the PSF was found to be limited to narrower angles compared to that of scattering at the ocular media. The comparison of simulated and optical data showed that beyond 2° at 560 nm and 4–4.5° at 650 nm the only phenomenon contributing to the PSF is scattering in the ocular media, whereas the fundus contribution can be assumed as negligible. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - April 24, 2017 Category: Opthalmology Authors: Dimitrios Christaras, Harilaos Ginis, Alexandros Pennos, Pablo Artal Tags: Feature Issue Article Source Type: research

Method of locating the visual axis objectively
ConclusionsThe proposed technique can be incorporated into any clinical wavefront sensing instrument and can be used for centration‐sensitive vision correction, as well as for other instances when knowing the exact position of the fovea is important. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - April 24, 2017 Category: Opthalmology Authors: Vasyl Molebny Tags: Original Article Source Type: research

Simulation of commercial vs theoretically optimised contact lenses for presbyopia
ConclusionOur previously optimised designs with 5 and 8 zones gave the best benefit and depth‐of‐focus. As their image quality is better than commercially available designs, it would be interesting to prototype these designs and to test them in a clinical setting. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - April 24, 2017 Category: Opthalmology Authors: Richard Legras, David Rio Tags: Feature Issue Article Source Type: research

Scleral changes with accommodation
ConclusionsScleral shape undergoes changes with accommodation and this phenomenon is more pronounced in myopes than emmetropes. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - April 24, 2017 Category: Opthalmology Authors: Alejandra Consejo, Hema Radhakrishnan, D. Robert Iskander Tags: Original Article Source Type: research

Eye retraction and rotation during Corvis ST ‘air puff’ intraocular pressure measurement and its quantitative analysis
ConclusionsThe curves describing corneal behaviour during air puff tonometry were determined and show that the eye globe rotates towards the nose during measurement. In addition, eye retraction amplitudes may be related to elastic or viscoelastic properties of deeper structures in the eye or behind the eye and this should be further investigated. Many of the proposed new parameters present comparable or even higher repeatability than the standard parameters provided by the Corvis ST. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - April 24, 2017 Category: Opthalmology Authors: Agnieszka Boszczyk, Henryk Kasprzak, Agnieszka J óźwik Tags: Feature Issue Article Source Type: research

Visual and Physiological Optics: where will the journey lead us in 10  years?
(Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - April 24, 2017 Category: Opthalmology Authors: Jos J. Rozema, W. Neil Charman, David A. Atchison, Harilaos Ginis, Tags: Editorial Source Type: research

Compensation of corneal oblique astigmatism by internal optics: a theoretical analysis
ConclusionsPartial compensation of corneal astigmatism by internal optics is due mainly to the highly converging nature of wavefronts incident upon the lens resulting from corneal refraction. The degree of compensation is quadratically dependent on eccentricity but is expected to diminish as the eye accommodates. Neutralising the cornea by index‐matching defeats internal compensation, revealing classical, radially‐oriented oblique astigmatism in the isolated lens. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - March 8, 2017 Category: Opthalmology Authors: Tao Liu, Larry N. Thibos Tags: Feature Issue Article Source Type: research

Ophthalmology patients' interest in online access to clinic notes at three US clinics
ConclusionsPatients at three US eye clinics were strongly in favour of online access to ophthalmology notes and were optimistic this access would improve their understanding and self‐care. Ophthalmologists should consider offering online access to their notes to enhance doctor‐patient communication and improve clinical outcomes. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - March 1, 2017 Category: Opthalmology Authors: Bryan S. Lee, Natalia V. Oster, Galen Y. Chen, Leona L. Ding, Janice D. Walker, Joann G. Elmore Tags: Original Article Source Type: research

Is an objective refraction optimised using the visual Strehl ratio better than a subjective refraction?
ConclusionsA method of simultaneously optimising sphere, cylinder, and axis from wavefront error measurements, using the visual image quality metric VSX, is described. In myopic subjects, visual performance, as measured by HC and LC VA, with this VSX‐objective refraction was found equivalent to that provided by subjective refraction, and was typically preferred over subjective refraction. Subjective refraction was preferred by habitually undercorrected hyperopic eyes. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - March 1, 2017 Category: Opthalmology Authors: Gareth D. Hastings, Jason D. Marsack, Lan Chi Nguyen, Han Cheng, Raymond A. Applegate Tags: Feature Issue Article Source Type: research

Differences in retinal shape between East Asian and Caucasian eyes
ConclusionEast Asians had steeper retinas than Caucasians. The horizontal meridian had steeper retinas than the vertical meridian. Myopes had steeper retinas than emmetropes. Racial differences in retinal shape in both emmetropes and myopes, combined with the high prevalence of myopia in East Asia, suggest that retinal shape may play a role in myopia development. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - March 1, 2017 Category: Opthalmology Authors: Pavan K. Verkicharla, Marwan Suheimat, Katrina L. Schmid, David A. Atchison Tags: Original Article Source Type: research

Cardinal and anti ‐cardinal points, equalities and chromatic dependence
ConclusionsPascal's ring and Pascal's ring extended are novel memory schema for remembering the equalities among the cardinal and anti‐cardinal points. The rings are useful for illustrating changes among the equalities and direction of shift of points when an aspect of a system changes. Care should be taken when defining concepts that rely on cardinal points that depend on frequency. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - March 1, 2017 Category: Opthalmology Authors: Tanya Evans, William F. Harris Tags: Feature Issue Article Source Type: research

Overestimation of stereo thresholds by the TNO stereotest is not due to global stereopsis
DiscussionThe results indicate that the global – local distinction is an unlikely explanation for the overestimated thresholds of TNO. Test protocol and disparities are one contributing factor. Potential additional factors include the nature of the task (TNO requires depth discrimination rather than detection) and the use of anaglyph red/green 3D glasses rather than polarizing filters, which may reduce binocular fusion. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - March 1, 2017 Category: Opthalmology Authors: Kathleen Vancleef, Jenny C. A. Read, William Herbert, Nicola Goodship, Maeve Woodhouse, Ignacio Serrano ‐Pedraza Tags: Original Article Source Type: research

Quantitative analysis of eyes and other optical systems in linear optics
ConclusionsThe spaces are suitable for quantitative analysis of the optical character of eyes and many other systems. Distances and angles can be defined in the inner‐product spaces. The optical systems may have multiple separated astigmatic and decentred refracting elements. (Source: Ophthalmic and Physiological Optics)
Source: Ophthalmic and Physiological Optics - February 28, 2017 Category: Opthalmology Authors: William F. Harris, Tanya Evans, Radboud D. Gool Tags: Feature Issue Article Source Type: research