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The main line of research of our Group of Vision Sciences at the University of Murcia (CiVi-UM) lies in the fundamental and applied studies of accommodation and its loss with age (presbyopia).

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Myopes accommodate more than hyperopes

Imagine two eyes with the same optics that change their lens exactly the same during accommodation, but one has a larger vitreous chamber length than the other (i.e. one is myope and the other is hyperope): do they accommodate the same? The answer is NO. The one with a larger vitreous chamber length (myope) accommodates more! We show why in this article published in IOVS.
accommodation

Novel methodology to improve visual quality

If the optics of an eye shows part that produces deteriorated retinal images, why not to hide them instead to corrected their optics? That is the simple solutions that we have proposed in this article published in Biomedical Optics Express. We spatially modulating the amplitude of light passing into the eye (related to the eye’s transmittance), in contrast to traditional correction of the wavefront phase (related to the local refractive power). Numerical simulations show that masking the aberrated areas at the pupil plane should enhance visual function, especially in highly aberrated eyes. This correction could be implemented in practice using customized contact or intraocular lenses.
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8 studies presented in the worldwide largest Vision meeting (ARVO2016, Seattle)

Several members and collaborators from CiViUM have presented recently some research studies in the Annual Meeting organized by the Association for the çResearch in Vision and Ophthalmology (ARVO), celebrated in Seattle (WA, USA).

Seattle

The papers and posters presented were:

  • G. Labuz et al. Straylight from explanted intraocular lenses.
  • E. Papadatou et al. Assessing the optical quality of commercially available intraocular lenses by means of modulation transfer function and straylight.
  • J. Zapata-Diaz et al. Impact of higher-order aberrations on depth-of-field.
  • I. Marin-Frach et al. Does dynamic accommodation respond to the shape of the blurred retinal image without changes in physical vergence?
  • P. Bernal-Molina et al. Effect of phenylephrine on static and dynamic accommodation.
  • N. Lopez-Gil et al. Retinal blood vessels may be used to detect the sign of defocus.
  • S. Bonaque-Gonzalez et al. Improving vision by pupil shape optimization. (Awarded with a ARVO travel grant).
  • M. Jaskulski et al. Retinal Image Simulation and Image Quality Estimation of MPlus Multi-Focal IOL’s Based on Aberrometric Data.

Link for the full abstracts: http://www.arvo.org/online_planner/

Summer Course on Current Aspects of Vision with professors Arthur Bradley and Feng Xu of the University of Indiana

Between the 2 and the 4 of september, in the beautiful locale of Águilas (Murcia) we will celebrate the XIII edition of the Summer Course on the Current Aspects of Vision. Various professors and vision professionals will give talks and practical workshops, and there also a round table will be held where all of the important questions about clinical practice will be answered. This year we have the pleasure of hosting the professors Arthur Bradley and Feng Xu, from the School of Optometry of the University of Indiana, who will tell us about the applications of new technologies to vision.

Unimar 2016
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Just like each year, various commercial companies will finance the stay of the first 30 students inscribed. If interested, please contact: visionunimar@gmail.com.
Inscriptions: https://www.um.es/unimar/.
We are looking forward to seeing you there!

All the best,
Norberto López Gil and Vicente A. Fernández Sánchez (directors of the course).

The Nobel Prize that Einstein never won

Editorial in Journal of Optometry which explains why Albert Einstein never won the Nobel Prize by his Theory of Relativity: http://www.sciencedirect.com/science/article/pii/S1888429615001004
Norberto_en_Estocolmo

Adding spherical aberration with the hyperopic LASIK

Sergio Bonaque (CiViUM and Instituto Oftalmológico Amigó) has published a new manuscript in the Journal of Refractive Surgery in collaboration with the University of Oklahoma (USA). In this paper they indicate how to reduce the induction of spherical aberration in the hyperopic LASIK. These results are applicable when the WaveLight Allegretto platform is used, a very common refractive surgery laser used in Europe.

http://www.healio.com/ophthalmology/journals/jrs/2015-12-31-12/%7B90218bb1-2ef2-4e7a-bc48-d68909395f15%7D/control-of-induced-spherical-aberration-in-moderate-hyperopic-lasik-by-customizing-corneal-asphericity

The orientation of “Mplus” intraocular lenses should be changed for each patient

Recent research that the CiViUM carried out in colaboration with the department of Optics of the University of La Laguna has been published in one of the most prestigious journals of ophtalmology, the Journal of Refractive Surgery. It consisted of the simulation of the effects of a multifocal, assimetrical lens (Mplus) on vision when it was implanted in different orientations into the human eye.

paper

The results indicate that when the surgery is personalized for each patient, an improvement of visual quality within the range from 20% to 121% can be achieved. This work may change the paradigm of premium cataract surgery, allowing for a significant improvement of results in the majority of patients. Link to the original article: here.

Method for in vitro assessment of straylight from intraocular lenses

Ocular straylight has been measured by means of psychophysical methods over the years. This approach gives a functional parameter yielding a straight comparison with optically defined light scattering, and the Point Spread Function. This is of particular importance when the effect of intraocular lenses (IOLs) on postoperative straylight is sought. An optical system for straylight measurements of IOLs was adapted to a commercial device (C-Quant, Oculus), which employs such psychophysical method. A measurement principle of the proposed by the CiViUM group methodology along with the results of different IOL models have been recently published in the Journal of Biomedical Optics Express (G. Łabuz, F. Vargas-Martín, T.J.T.P. van den Berg, N. López-Gil, “Method for in vitro assessment of straylight from intraocular lenses,” Biomed. Opt. Express 6, 4457-4464)

The CiViUM in the 15th International Myopia Conference in Wenzhou, China

Researchers at CiViUM presented their first experimental results on the effect of high-order aberrations in dynamic accommodation and a theoretical optical explanation for the larger lag found in myopes in comparison with emmetropes or hyperopes at The 15th International Myopia Conference that was hold on September 23-27, 2015 in Wenzhou, P. R. China. López-Gil et al. showed that clinical experiments can easily avoid artifactual apparent lag of perfectly accommodating axial myopic eye by choosing the appropriate reference plane.

Grupo CiViUM en Wenzhou, China.

Marín-Franch et al. presented the experimental results on effect of astigmatism and spherical aberration in dynamic accommodation. From these early stage results, astigmatism seemed to give cues for the sign of defocus in 2 out of 5 subject eyes, whereas spherical aberration did not. These are the first experimental results obtained with the MurciAO (the Murcia adaptive optics system in CiViUM’s lab) for the ERC project ERC-­2012­‐StG­‐309416­‐SACCO entitled “Signals for Accommodative Responses in Humans”, made in collaboration with the GIO group at the Universitat de Valencia and Phil Kruger from SUNY in New York. More information here.

civium (from latin, genitive plural of civis-civis, "belong to the citizens")