December 2011
Volume 11, Issue 15
Free
OSA Fall Vision Meeting Abstract  |   December 2011
Measuring Volume Scotoma in Bitemporal, Binasal and Central Field Loss
Author Affiliations
  • PremNandhini Satgunam
    Harvard Medical School
  • Eli Peli
    Harvard Medical School
Journal of Vision December 2011, Vol.11, 61. doi:10.1167/11.15.61
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      PremNandhini Satgunam, Eli Peli; Measuring Volume Scotoma in Bitemporal, Binasal and Central Field Loss. Journal of Vision 2011;11(15):61. doi: 10.1167/11.15.61.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Volume scotoma (blind areas projected in depth) is theoretically predicted from combining monocular visual fields. However, computation from monocular perimetry assumes known retinal fixation locus. Conventional perimeters (Humphrey and Goldmann) are not suitable to measure volume scotoma since the visual fields are mapped at the fixation plane. We developed methods to directly measure volume perimetry in cases of interest. Using computerized dichoptic perimeter and a fixation target in front of the screen a volume field behind fixation is measured. Such scotomas are expected in bitemporal (hemianopic) and in central field loss (CFL). Volume scotoma in front of fixation occurring with binasal and CFL can be measured using a transparent screen placed in front of the fixation and targets presented over it using a laser pointer. Measurements of volume fields are consistent showing scotomas behind fixation or in front, for bitemporal and binasal field loss, respectively, and a rapid shrinking scotoma behind closer fixation for patients with small CFL. With direct binocular measurements of volume scotoma no assumptions are needed. The measurements done binocularly demonstrate volume scotoma and if done dichopticaly can show each eye's contribution, and the results may have important implications for various daily activities.

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×