Monthly Archives: October 2017

Role of parafovea in blur perception published in Vision Research


The blur experienced by our visual system is not uniform across the visual field. Additionally, lens designs with variable power profile such as contact lenses used in presbyopia correction and to control myopia progression create variable blur from the fovea to the periphery. We studied the perceived neutral focus with images of different angular subtense (from 4° to 20°) and found that the amount of blur, for which focus is perceived as neutral, increases with stimulus size. We also studied the changes in central perceived neutral focus after adaptation to images with similar magnitude of optical blur across the image or varying blur from center to the periphery. Altering the blur in the periphery had little or no effect on the shift of perceived neutral focus following adaptation to normal/blurred central images. These perceptual outcomes should be considered while designing bifocal optical solutions for myopia or presbyopia.

The study is a result of collaborative work between the Department of Applied Physics, KTH, Royal Institute of Technology and VioBio Lab, Instituto de Optica CSIC, in the context of Marie Curie ITN Opal.

The results are published in Vision Research: A. Venkatamaran, A. Radhakrishan, C. Dorronsoro, L. Lundström & S. Marcos, “Role of Parafovea in blur perception”, Vision Research 138, 59-65 (2017).

Full article here.

SimVis Patent awarded Best Patent of the Year by Fundación Madri+d


Congratulations to Carlos Dorronsoro, José Ramón Alonso and Susana Marcos, inventors of Patent “Miniaturized Simultaneous Vision Simulator”, which has been awarded with the Best Patent Award by Fundación Madrid+d. The jury has positively evaluated the large market potential for a device that addresses the aging of the population. The patent, along two others owned by CSIC, and licensed to the spin-off company 2EyesVision, is the core technology of SimVis, a wearable see-through simulator of multifocal corrections for presbyopia.

– Press release by Fundación Madri+d 

– Press release by CSIC.

– More information about the patent’s technology here

Spin-off 2EyesVision showcasts SimVis Technology at ESCRS Exhibit


2EyesVision, a spin-off of CSIC founded by VIOBIO Lab members was present at the European Society of Cataract and Refractive Surgery Exhibit with a booth showcasting SimVis technology. Hundreds of delegates could experience multifocality with SimVis wearable, bifocal, programmable, see-through device.

More information on 2EyesVision and SimVis:

Sara El Aissati granted FPU to follow PhD work in VioBio Lab

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Congratulations to Sara El Aissati, winner of a Predoctoral Fellowship of the highly competitive program FPU (Formacion Personal Universitario) from the Spanish Government (Ministry of Education). She will be investigating the use of different adaptive optics technologies to simulate presbyopic corrections.

More information of FPU Program:

Alberto de Castro, COFUND Multiply Postdoctoral Fellow joins VIOBIO Lab



We welcome Dr. Alberto de Castro who joins the Visual Optics and Biophotonics Lab under the Marie Curie COFUND Action MULTIPLY.

Alberto de Castro developed his PhD thesis at the Institute of Optics under the supervision of Prof. Susana Marcos presenting the first estimates 3-D Gradient Index profiles of human crystalline lenses, based on OCT, for which he received the PhD thesis extraordinary Award from the University of Valladolid. He joins VioBio after several years of postdoctoral training in Indiana University (Steve Burns’ Laboratory) and Universidad de Murcia (Pablo Artal’s Lab) where he has worked on high resolution ocular imaging. His COFUND MULTIPLY project combines sophisticated ocular imaging and intraocular lens design.

COFUND MULTIPLY Program is an International Mobility and Training Program in Photonics for Experienced Researchers coordinated by Aston University. The Institute of Optics (CSIC) is one of the partners of the international research consortium.

More information about Multiply:

Mercedes Romero, granted CSIC JAE INTRO Fellowship at the Visual Optics and Biophotonics Lab

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We congratulate Merche Romero, MSc in Optical Technologies, who has been granted a JAE INTRO Fellowship to undertake research at the Visual Optics and Biophotonics Lab.  JAE Intro is a highly competitive program from CSIC to introduce students to a research career.

More information about JAE INTRO:

VIOBIO Lab at ESCRS and satellite meetings

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VIOBIO Lab will be present at the XXXV European Society of Cataract and Refractive Surgery Annual Congress in Lisbon with 4 invited and 2 contributed talks.

In addition, VIOBIO lab members will present at satellite meetings in Lisbon: the International Society of Presbyopia Conference (ISOP), chaired this year by Susana Marcos, and various user scientific meetings. Further more, spin-off company 2EyesVision will present the SimVis technology at a booth at ESCRS (#P1147).

Link to ESCRS Programme:

Link to ISOP Programme:                                                                 

Follow the schedule of VIOBIO presentations Oct 5-10 2017 in Lisbon: 

Thursday 5. Corvis ST Research User Meeting: 

7:40 pm – 7:50 pm Susana Marcos. “Inherent corneal biomechanical properties from Corvis air puff deformation following two cross-linking modalities in rabbit model in vivo”

Friday 6. International Society of Presbyopia (ISOP):

10:14am – 10:22am. Prof. Susana Marcos “Surface Changing AIOL Enabled by Photobonded Haptics”

2:33pm – 2:41pm. Enrique Gambra “Simultaneous Vision Simulator”

4:30pm – 4:38pm. Carlos Dorronsoro “Testing Tolerance/Preference for Monovision, Modified Monovision and Multifocality”

Saturday 7
XXXV Congress of the ESCRS:

4:10pm – 4:25pm. Prof. Susana Marcos. Clinical Research Symposia. “OCT”

 Hoya Surgical Optics Symposium:

7:10pm – 7:20pm. Prof. Susana Marcos “New Optical Dynamic bench mark tests of lenses and influence of the Aspheric Profile on the image quality”

Sunday 8. XXXV Congress of the ESCRS:


8:05am – 8:25am. Susana Marcos. Workshop on Visual Optics. “Light Propagation in the Eye”

8:25am – 8:55am. Susana Marcos. Workshop on Visual Optics. “Aberrations of the optical system”

9:08am – 9:14am. Susana Marcos. Free Paper Session: Pseudophakic IOLs: Multifocal I. “In vivo measurement of longitudinal chromatic aberration in patients implanted with the FineVision Trifocal IOL”

11:16am – 11:22am. Carlos Dorronsoro. Free Paper Session: Pseudophakic IOLs: Multifocal II. “Pre-surgical visual simulations of real multifocal lenses with different optical methods”

Tuesday 10. XXXV Congress of the ESCRS:

3:30pm – 3:50pm. Susana Marcos. Presbyopia Workshop.”Contact lens technology and application in presbyopia”


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