Bio

Bio


My interest in optics research started during my undergraduate studies. I worked on better methods to detect the optical degradation in the images of ground-based astronomical telescopes due to atmospheric turbulence as part of my Ph.D. studies at the Indian Institute of Science. During my first postdoctoral position in University College Dublin, I developed digital methods using spatial light modulators for measuring the wave distortions in optical microscopy and vision science. Pyramid, point diffraction, Hartmann-Shack, and confocal signal-based wavefront sensors were explored. At the Institute of Optics in Madrid, as part of my second postdoctoral position, I worked on accurate optical quality evaluation techniques for patients implanted with multifocal intraocular lenses, and contributed to the development of mathematical methods and experimental validations to facilitate the demonstration of multifocal vision for prospective refractive surgery patients and contact lens wearers using a simultaneous vision simulator based on the tunable lens that works on the principle of temporal multiplexing.

Current Role at Stanford


We develop next-generation ocular imaging devices to allow non-invasive visualization of subcellular structures in the eye with the goal of building clinically useful tools that help in early disease diagnosis and monitoring.

Honors & Awards


  • Outstanding Reviewer Recognition, Optical Society of America (2016)
  • Robert S. Hilbert Memorial Student Travel Grant, Optical Society of America and Optical Research Associates (2011)

Education & Certifications


  • Ph.D., Indian Institute of Science (2012)
  • Master of Science, Sri Sathya Sai Institute of Higher Learning (2006)
  • Bachelor of Science, Sri Sathya Sai Institute of Higher Learning (2004)

Professional

Work Experience


  • Senior Post Doctoral Researcher, Instituto de Optica (IO-CSIC) (12/22/2014 - 2/13/2018)

    Location

    Madrid, Spain

  • Post Doctoral Researcher, University College Dublin (3/14/2012 - 8/31/2014)

    Location

    Dublin, Ireland

Professional Affiliations and Activities


  • Chair, Vision Technical Group, Optical Society of America (2019 - Present)
  • Committee Member, Optical Society of America (Optical Metrology Technical Group) (2014 - Present)

Publications

All Publications


  • Visual simulators replicate vision with multifocal lenses Scientific Reports Vinas, M., Benedi-Garcia, C., Aissati, S., Pascual, D., Akondi, V., Dorronsoro, C., Marcos, S. 2019; 9 (1)
  • Tunable lenses: dynamic characterization and fine-tuned control for high-speed applications Optics Express Dorronsoro, C., Barcala, X., Gambra, E., Akondi, V., Sawides, L., Marrakchi, Y., Rodriguez-Lopez, V., Benedi-Garcia, C., Vinas, M., Lage, E., Marcos, S. 2019; 27 (3): 2085-2100

    Abstract

    Tunable lenses are becoming ubiquitous, in applications including microscopy, optical coherence tomography, computer vision, quality control, and presbyopic corrections. Many applications require an accurate control of the optical power of the lens in response to a time-dependent input waveform. We present a fast focimeter (3.8 KHz) to characterize the dynamic response of tunable lenses, which was demonstrated on different lens models. We found that the temporal response is repetitive and linear, which allowed the development of a robust compensation strategy based on the optimization of the input wave, using a linear time-invariant model. To our knowledge, this work presents the first procedure for a direct characterization of the transient response of tunable lenses and for compensation of their temporal distortions, and broadens the potential of tunable lenses also in high-speed applications.

    View details for DOI 10.1364/OE.27.002085

  • Experimental validations of a tunable-lens-based visual demonstrator of multifocal corrections Biomedical Optics Express Akondi, V., Sawides, L., Marrakchi, Y., Gambra, E., Marcos, S., Dorronsoro, C. 2018; 9 (12): 6302-6317

    View details for DOI 10.1364/BOE.9.006302

  • Temporal multiplexing to simulate multifocal intraocular lenses: theoretical considerations Biomedical Optics Express Akondi, V., Dorronsoro, C., Gambra, E., Marcos, S. 2017; 8 (7): 3410-3425

    View details for DOI 10.1364/BOE.8.003410

  • In Vivo Measurement of Longitudinal Chromatic Aberration in Patients Implanted With Trifocal Diffractive Intraocular Lenses Journal of Refractive Surgery Vinas, M., Gonzalez-Ramos, A., Dorronsoro, C., Akondi, V., Garzon, N., Poyales, F., Marcos, S. 2017; 33 (11): 736-742
  • Evaluation of the true wavefront aberrations in eyes implanted with a rotationally asymmetric multifocal intraocular lens Journal of Refractive Surgery Akondi, V., Pérez-Merino, P., Martinez-Enriquez, E., Dorronsoro, C., Alejandre, N., Jiménez-Alfaro, I., Marcos, S. 2017; 33 (4): 257-265
  • Virtual pyramid wavefront sensor for phase unwrapping Applied optics Akondi, V., Vohnsen, B., Marcos, S. 2016; 55 (29): 8363-8367

    View details for DOI 10.1364/AO.55.008363

  • Phase unwrapping with a virtual Hartmann-Shack wavefront sensor Optics Express Akondi, V., Falldorf, C., Marcos, S., Vohnsen, B. 2015; 23 (20): 25425-25439

    View details for DOI 10.1364/OE.23.025425

  • Optimization of sensing parameters for a confocal signal-based wavefront corrector in microscopy Journal of Modern Optics Jewel, A. R., Akondi, V., Vohnsen, B. 2015; 62 (10): 786-792
  • Closed-loop adaptive optics using a spatial light modulator for sensing and compensating of optical aberrations in ophthalmic applications Journal of Biomedical Optics Akondi, V., Jewel, A. R., Vohnsen, B. 2014; 19 (9): 096014-096014
  • Multi-faceted digital pyramid wavefront sensor Optics Communications Akondi, V., Castillo, S., Vohnsen, B. 2014; 323: 77-86
  • Digital phase-shifting point diffraction interferometer Optics Letters Akondi, V., Jewel, A. R., Vohnsen, B. 2014; 39 (6): 1641-1644

    View details for DOI 10.1364/OL.39.001641

  • Myopic aberrations: Simulation based comparison of curvature and Hartmann Shack wavefront sensors Optics Communications Basavaraju, R. M., Akondi, V., Weddell, S. J., Budihal, R. P. 2014; 312: 23-30
  • A direct comparison between a MEMS deformable mirror and a liquid crystal spatial light modulator in signal-based wavefront sensing Journal of the European Optical Society-Rapid publications Jewel, A. R., Akondi, V., Vohnsen, B. 2013; 8: 13073-1 - 13073-10

    View details for DOI 10.2971/jeos.2013.13073

  • Digital pyramid wavefront sensor with tunable modulation Optics Express Akondi, V., Castillo, S., Vohnsen, B. 2013; 21 (15): 18261-18272

    View details for DOI 10.1364/OE.21.018261

  • Myopic aberrations: impact of centroiding noise in Hartmann Shack wavefront sensing Ophthalmic and Physiological Optics Akondi, V., Vohnsen, B. 2013; 33 (4): 434-443

    View details for DOI 10.1111/opo.12076

  • X-ray attenuation coefficient of mixtures: Inputs for dual-energy CT Medical Physics Haghighi, R. R., Chatterjee, S., Akondi, V., Kumar, P., Thulkar, S. 2011; 38 (10): 5270–5279

    View details for DOI 10.1118/1.3626572