PURPOSE: To measure eccentric fixation characteristics in visual fields of patients with Stargardt's disease. METHODS: The positions of fixation loci (FL) in the visual field were determined by Tübingen perimetry (TP), using the position of the blind spots in 173 patients. Altogether, 669 visual fields were measured at baseline and during follow-up. Twenty patients were also examined by scanning laser ophthalmoscope (SLO). RESULTS: Ninety-five of 173 patients showed a ring scotoma with central fixation in at least one test, which could persist for up to 18.8 years. The median age for a 50% chance of the development of eccentric fixation was 23.6 years. One hundred four patients (203 eyes) used eccentric fixation in at least one eye; in 154 eyes, the FL was placed below the scotoma and in 33 eyes to the left of it, in 11 to the right of it, and in 5 above it. Once the FL was chosen, it remained within the same visual field area at subsequent tests, varying on average by 1.76 degrees. Compared with SLO results, the mean distance between FL and PRL was 1.90 degrees. CONCLUSIONS: It is possible to determine the position of the FL by perimetry with sufficient accuracy if the blind spot is well delimited. Stargardt patients can keep central fixation for different time intervals before changing to an eccentric FL. Most of them show an FL below the central scotoma, which is considered favorable for horizontal reading.
PURPOSE: To measure eccentric fixation characteristics in visual fields of patients with Stargardt's disease. METHODS: The positions of fixation loci (FL) in the visual field were determined by Tübingen perimetry (TP), using the position of the blind spots in 173 patients. Altogether, 669 visual fields were measured at baseline and during follow-up. Twenty patients were also examined by scanning laser ophthalmoscope (SLO). RESULTS: Ninety-five of 173 patients showed a ring scotoma with central fixation in at least one test, which could persist for up to 18.8 years. The median age for a 50% chance of the development of eccentric fixation was 23.6 years. One hundred four patients (203 eyes) used eccentric fixation in at least one eye; in 154 eyes, the FL was placed below the scotoma and in 33 eyes to the left of it, in 11 to the right of it, and in 5 above it. Once the FL was chosen, it remained within the same visual field area at subsequent tests, varying on average by 1.76 degrees. Compared with SLO results, the mean distance between FL and PRL was 1.90 degrees. CONCLUSIONS: It is possible to determine the position of the FL by perimetry with sufficient accuracy if the blind spot is well delimited. Stargardt patients can keep central fixation for different time intervals before changing to an eccentric FL. Most of them show an FL below the central scotoma, which is considered favorable for horizontal reading.
Authors: Mira Goldschmidt; Anouk Déruaz; Erika N Lorincz; Andrew R Whatham; Christophe Mermoud; Avinoam B Safran Journal: BMC Res Notes Date: 2010-01-22
Authors: Tommaso Verdina; Vivienne C Greenstein; Andrea Sodi; Stephen H Tsang; Tomas R Burke; Ilaria Passerini; Rando Allikmets; Gianni Virgili; Gian Maria Cavallini; Stanislao Rizzo Journal: Graefes Arch Clin Exp Ophthalmol Date: 2017-04-02 Impact factor: 3.117
Authors: Tomas R Burke; Tobias Duncker; Russell L Woods; Jonathan P Greenberg; Jana Zernant; Stephen H Tsang; R Theodore Smith; Rando Allikmets; Janet R Sparrow; François C Delori Journal: Invest Ophthalmol Vis Sci Date: 2014-05-01 Impact factor: 4.799
Authors: Nuno L Gomes; Vivienne C Greenstein; Joshua N Carlson; Stephen H Tsang; R Theodore Smith; Ronald E Carr; Donald C Hood; Stanley Chang Journal: Invest Ophthalmol Vis Sci Date: 2009-03-25 Impact factor: 4.799