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Dr Alan Cayless

Profile summary

Professional biography

I am a physicist and astronomer and have been teaching with the Open University for over twenty years on a wide variety of physical science modules, primarily at second level.

My current position as Staff Tutor with the Physical Sciences Subteam gives me responsibility for a number of associate lecturers teaching on first and second level science, physics and astronomy modules.  I am also a member of the OpenScience Observatories team and co-author of the OpenLearn course Astronomy with an online telescope.

I currently teach on the second level module S217 The Physical World and am Module Chair of the second level module SXPS288 Remote experiments in physics and space.
 

Research interests

Research interests include:

- Medical and astronomical imaging
- Pupillometry
- Ophthlamology

I have links with a number of universities in Germany, including Tübingen and Saarland.
 

Teaching interests

Teaching interests include online delivery of science subjects, in particular methods of developing practical skills through the use of remote experiments and also interactive screen experiments.

I am also active in the area of public outreach, in particular public engagement in astronomy.  As a member and former chairman of Stirling Astronomical Society I help to organise and deliver activities such as telescope visits and stargazing evenings, and frequently give publicly-accessible talks and lectures on a variety of astronomical themes.

Publications

Similarity of eyes in a cataractous population—How reliable is the biometry of the fellow eye for lens power calculation? (2022-06)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Röggla, Veronika; Leydolt, Christina; Wendelstein, Jascha and Hoffmann, Peter
PLOS ONE, 17, Article e0269709(6)


Calculation of Equivalent and Toric Power in AddOn Lenses Based on a Monte Carlo Simulation (2022-06)
Langenbucher, Achim; Schrecker, Jens; Cayless, Alan; Hoffmann, Peter; Wendelstein, Jascha and Szentmáry, Nóra
Ophthalmic Research, 65(3) (pp. 300-309)


Simulation of photic effects after cataract surgery for off-axis light sources (2022)
Omidi, Pooria; Cayless, Alan and Langenbucher, Achim
PLOS ONE, 17, Article e0262457(1)


Prediction of the axial lens position after cataract surgery using deep learning algorithms and multilinear regression (2022)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Wendelstein, Jascha and Hoffmann, Peter
Acta Ophthalmologica ((Early access))


Translation model for anterior segment tomographic data to corneal spherical aberration derived from a Monte‐Carlo simulation based on raytracing (2022)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Münninghoff, Lena; Wortmann, Rosalie; Wendelstein, Jascha and Hoffmann, Peter
Acta Ophthalmologica ((Early Access))


Surgically induced astigmatism after cataract surgery – a vector analysis (2022)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Gasazza, Marina; Weisensee, Johannes; Hoffmann, Peter and Wendelstein, Jascha
Current Eye Research ((Accepted Manuscript Online))


Strategies for formula constant optimisation for intraocular lens power calculation (2022)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Wendelstein, Jascha and Hoffmann, Peter
PLOS ONE, 17, Article e0267352(5)


Translation model for CW chord to angle Alpha derived from a Monte-Carlo simulation based on raytracing (2022)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Weisensee, Johannes; Wendelstein, Jascha and Hoffmann, Peter
PLOS ONE, 17(5) (e0267028)


Evaluation of optimal Zernike radial degree for representing corneal surfaces (2022)
Omidi, Poori; Cayless, Alan and Langenbucher, Achim
PLOS ONE, 17(5) (e0269119)


Prediction of ocular magnification and aniseikonia after cataract surgery (2022)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Wendelstein, Jascha and Hoffmann, Peter
Acta Ophthalmologica ((Early access))


Meridional ocular magnification after cataract surgery with toric and non-toric intraocular lenses. (2022)
Langenbucher, Achim; Hoffmann, Peter; Cayless, Alan; Wendelstein, Jascha; Bolz, Matthias and Szentmáry, Nóra
Graefe's Archive for Clinical and Experimental Ophthalmology ((Early access))


Intensity simulation of photic effects after cataract surgery for off-axis light sources (2022)
Omidi, Poori; Cayless, Alan and Langenbucher, Achim
PLOS ONE, 17, Article e0272705(8)


Decreased FABP5 and DSG1 protein expression following PAX6 knockdown of differentiated human limbal epithelial cells (2021-12-20)
Katiyar, Priya; Stachon, Tanja; Fries, Fabian N.; Parow, Frederika; Ulrich, Myriam; Langenbucher, Achim; Cayless, Alan; Seitz, Berthold; Käsmann-Kellner, Barbara; Latta, Lorenz and Szentmáry, Nóra
Experimental Eye Research, 215, Article 108904


IOL Formula Constants: Strategies for Optimization and Defining Standards for Presenting Data (2021-12-02)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Müller, Michael; Eppig, Timo; Schröder, Simon and Fabian, Ekkehart
Ophthalmic Research, 64(6) (pp. 1055-1067)


Simulation of Corneal imaging properties for near objects (2021-09)
Langenbucher, Achim; Eppig, Timo; Cayless, Alan; Gatzioufas, Zisis; Wendelstein, Jascha; Hoffmann, Peter and Szentmáry, Nóra
Ophthalmic and Physiological Optics, 41(5) (pp. 1152-1160)


Optimal Dataset Sizes for Constant Optimization in Published Theoretical Optical Formulae (2021-08-24)
Langenbucher, Achim; Schwemm, Michael; Eppig, Timo; Schröder, Simon; Cayless, Alan and Szentmáry, Nóra
Current Eye Research ((Early Access))


Considerations on the Castrop formula for calculation of intraocular lens power (2021-06-02)
Achiron, Asaf; Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Weisensee, Johannes; Fabian, Ekkehard; Wendelstein, Jascha and Hoffmann, Peter
PLOS ONE, 16, Article e0252102(6)


Prediction model for best focus, power, and spherical aberration of the cornea: Raytracing on a large dataset of OCT data (2021-02-22)
Langenbucher, Achim; Szentmáry, Nóra; Weisensee, Johannes; Wendelstein, Jascha; Cayless, Alan; Menapace, Rupert and Hoffmann, Peter
PLOS ONE, 16, Article e0247048(2)


Corneal back surface power – interpreting keratometer readings and what predictions can tell us (2021-02)
Langenbucher, Achim; Eppig, Timo; Schröder, Simon; Cayless, Alan and Szentmáry, Nóra
Zeitschrift für Medizinische Physik, 31(1) (pp. 89-93)


Comparison of spherical and aspherical intraocular lenses with decentration and tilt error using a physical model of human contrast vision and an image quality metric (2021-01-26)
Oltrup, Theo; Bende, Thomas; Al-Mohamedi, Haroun; Cayless, Alan; Bende, Marvin; Leitritz, Martin A. and Bartz Schmidt, Karl-Ulrich
Zeitschrift für Medizinische Physik ((Early Access))


Back‐calculation of keratometer index based on OCT data and raytracing – a Monte Carlo simulation (2021)
Langenbucher, Achim; Szentmáry, Nóra; Weisensee, Johannes; Cayless, Alan; Menapace, Rupert and Hoffmann, Peter
Acta Ophthalmologica ((Early Access))


Calculation of ocular magnification in phakic and pseudophakic eyes based on anterior segment OCT data (2021)
Langenbucher, Achim; Szentmáry, Nóra; Leydolt, Christina; Cayless, Alan; Schwarzenbacher, Luca; Zsolt Nagy, Zoltán and Menapace, Rupert
Ophthalmic & Physiological Optics ((Early Access))


Ratio of torus and equivalent power to refractive cylinder and spherical equivalent in phakic lenses – a Monte‐Carlo simulation study (2021)
Langenbucher, Achim; Schrecker, Jens; Eppig, Timo; Schröder, Simon; Cayless, Alan; Schwemm, Michael; Nagy, Zoltán and Szentmáry, Nóra
Acta Ophthalmologica ((Early Access))


Extended measuring depth dual-wavelength Fourier domain optical coherence tomography (2021)
Al-Mohamedi, Haroun; Kelly-Pérez, Ismael; Oltrup, Theo; Cayless, Alan and Bende, Thomas
Biomedical Engineering / Biomedizinische Technik ((Early Access))


Benefits and New Features of a Modern International Internet Database “IOLCon” for Updated and Optimized IOL Constants and IOL Specifications (2021)
Scholtz, Sibylle Katharina; Schwemm, Michael; Eppig, Timo; Cayless, Alan and Langenbucher, Achim
Klinische Monatsblätter für Augenheilkunde ((Early access))


The Castrop formula for calculation of toric intraocular lenses (2021)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Weisensee, Johannes; Wendelstein, Jascha and Hoffmann, Peter
Graefe's archive for clinical and experimental ophthalmology ((Early Access))


Prediction of total corneal power from measured anterior corneal power on the IOLMaster 700 using a feedforward shallow neural network (2021)
Langenbucher, Achim; Cayless, Alan; Szentmáry, Nóra; Weisensee, Johannes; Wendelstein, Jascha and Hoffmann, Peter
Acta Ophthalmologica ((Early access))


Prediction of corneal back surface power – Deep learning algorithm versus multivariate regression (2021)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Weisensee, Johannes; Wendelstein, Jascha and Hoffmann, Peter
Ophthalmic and Physiological Optics ((Early access))


Prediction of CW chord as a measure for the eye’s orientation axis after cataract surgery from preoperative IOLMaster 700 measurement data (2021)
Langenbucher, Achim; Szentmáry, Nóra; Cayless, Alan; Weisensee, Johannes; Wendelstein, Jascha and Hoffmann, Peter
Acta Ophthalmologica ((Early access))


A systematic comparison and evaluation of three different Swept-Source interferometers for eye lengths biometry (2019-02)
Al-Mohamedi, Haroun; Kelly-Pérez, Ismael; Prinz, Andreas; Oltrup, Theo; Leitritz, Martin; Cayless, Alan and Bende, Thomas
Zeitschrift für Medizinische Physik, 29(1) (pp. 16-21)


Reproducibility and normal values of static pupil diameters (2018-03-01)
Schröder, Simon; Chashchina, Ekaterina; Janunts, Edgar; Cayless, Alan and Langenbucher, Achim
European Journal of Ophthalmology, 28(2) (pp. 150-156)


Endothelial alterations in 712 keratoconus patients (2018-02-14)
Goebels, Susanne; Eppig, Timo; Seitz, Berthold; Szentmàry, Nòra; Cayless, Alan and Langenbucher, Achim
Acta Ophthalmologica, 96(2) (e134-e139)


Complementary Keratoconus Indices Based on Topographical Interpretation of Biomechanical Waveform Parameters: A Supplement to Established Keratoconus Indices (2017-02-07)
Goebels, Susanne; Eppig, Timo; Wagenpfeil, Stefan; Cayless, Alan; Seitz, Berthold and Langenbucher, Achim
Computational and Mathematical Methods in Medicine, 2017, Article 5293573


First results of automated RAPD-SWIFT method in dynamic pupillometry (2016-06)
Cayless, Alan and Bende, Thomas
Zeitschrift für Medizinische Physik, 26(2) (pp. 143-149)


Comparison of 3 biometry devices in cataract patients (2015-11-01)
Goebels, Susanne; Pattmöller, Max; Eppig, Timo; Cayless, Alan; Seitz, Berthold and Langenbucher, Achim
Journal of Cataract & Refractive Surgery, 41(11) (pp. 2387-2393)


Staging of keratoconus indices regarding tomography, topography, and biomechanical measurements (2015-04)
Goebels, Susanne; Eppig, Timo; Wagenpfeil, Stefan; Cayless, Alan; Seitz, Berthold and Langenbucher, Achim
American Journal of Ophthalmology, 159(4) (pp. 733-738)


Interactive screen experiments: innovative virtual laboratories for distance learners (2009-07)
Hatherly, P.A.; Jordan, S.E. and Cayless, A.
European Journal of Physics, 30(4) (pp. 751-762)


Exploring the use of labcasts to support associate lecturers (2020-04-30)
Brown, Venetia; Cayless, Alan and Jarvis, Jo
In : 9th eSTEeM Annual Conference: Informing Student Success - From Scholarship to Practice (29-30 Apr 2020, Virtual)


Dynamische Pupillometrie für RAPD – neueste Entwicklungen (2015-06-09)
Cayless, Alan and Bende, Thomas
In : 28th International Congress of German Ophthalmic Surgeons (DOC) (11-13 Jun 2015, Leipzig)