Visual Psychophysics / Physiological Optics - ARVO

ARVO 2013 Annual Meeting Abstracts by Scientific Section/Group – Visual Psychophysics / Physiological OpticsSustained benefits of Therapeutic Tinted Contact Lenses (CL) inpatients with AlbinismFaheemah Saeed 1 , Darrell G. Schlange 2 , Tina Najafi 3 . 1 IllinoisCollege of Optometry, Chicago, IL; 2 Illinois College of Optometry,Chicago, IL; 3 Illinois College of Optometry, Chicago, IL.Purpose: To determine whether the improvement in visual functionand nystagmus eye movements observed in patients with Albinismusing tinted CL correction is sustained after 6 months following theinitial dispense. Improved visual function and nystagmus eyemovements in 20 patients with Albinism resulting from tinted CL usewere reported last year. Results collected 6 months after the initialCL dispense are now being reported on 13 returning patients.Methods: 20 subjects were fitted with soft toric CL’s that were thencustom tinted to create an artificial iris. Dependent variablesincluding visual acuity (VA), contrast sensitivity (CS) with andwithout glare, and nystagmus eye movement recordings were testedagain while wearing tinted CLs, 6 months following the initialdispense of tinted CL. The EDTRS chart was used to measure visualacuity. The CSV-1000HGT (halogen glare test) and 1000E (ContrastSensitivity chart) were used to measure the contrast sensitivityfunction and effect of glare. Nystagmus eye movement characteristicsof intensity and foveation were recorded and analyzed with anISCAN system (RK 826PCI) that uses a video based dark pupil-tocorneareflection method.Results: The improved logMar VA observed with tinted CLs wasstill present at the 6 month follow up visit, as the difference obtainedat the two visits did not differ significantly (t= 1.72, p=0.11). MeanCS under normal testing conditions was further improved at the 6month follow up visit (t= 2.49, p=0.028) while the mean CS withglare did not differ between the two visits (t= 1.17, P=0.266). ISCANrecordings with 3 runs in each of 5 gaze positions showed that thereduced intensity of nystagmus was also maintained with tinted CLwear after 6 months (t= 0.61, p=0.557).Conclusions: We previously reported that VA, Nystagmus intensityand CS with and without glare were significantly improved withtinted CL wear in patients with albinism. The current study indicatesthat these significant improvements are maintained or even increasedfor at least six months following initial dispensing of tinted CL’s.Commercial Relationships: Faheemah Saeed, None; Darrell G.Schlange, None; Tina Najafi, NoneProgram Number: 2779 Poster Board Number: B0033Presentation Time: 8:30 AM - 10:15 AMEvaluating center of pressure (CoP) measures of posturalstability in low and normal vision using the Nintendo WiiBalance Board TM (WBB)Pamela E. Jeter 1 , Jialiang Gu 2 , Judith E. Goldstein 1 , Ava K. Bittner 1 ,Gislin Dagnelie 1 . 1 Ophthalmology, Johns Hopkins University,Baltimore, MD; 2 Electrical & Computer Engineering, CarnegieMellon University, Pittsburgh, PA.Purpose: To evaluate Center of Pressure measures obtained on acommercially available Nintendo Wii Balance Board TM (WBB) in agroup of low vision (LV) and normal participants.Methods: Subjects with low vision (visual acuity worse than 20/70and/or visual field less than 40°, in the better eye, N=7) and subjectswith corrected-to-normal vision (N=5), completed the modifiedClinical Test of Sensory Interaction on Balance (mCTSIB) whichincludes four sensory conditions: double-leg standing on a firmsurface with eyes open (EO-firm); standing on a firm surface witheyes closed (EC-firm); standing on an unstable (3” thick) surfacewith EO (EO-foam); and standing on an unstable surface with EC(EC-foam). Subjects performed each condition for 4 successive trialsfor up to 30 seconds with a one-minute rest period in between. Theconditions were randomly ordered. Center of Pressure (COP)outcomes were derived from data sent by the 4 force plate sensors inthe WBB to a laptop via Bluetooth. The COP measures include rootmean square (RMS) of the COP excursion (mm), RMS of velocity(mm/s), mean total velocity (MTV, mm/s), and area (mm2).Results: In the LV group, all COP measures differed significantlybetween firm and foam conditions with EC and EO (all p0.05) and between the EO-foam and EC-foamcondition. No significant differences were found across all variableswhen comparing LV participant COP measures to normal participantswith the exception of MTV and area in the EO-firm condition(p=0.01 and p = 0.03, respectively).Conclusions: This pilot study uses the WBB for determining posturalstability in a LV and normal group. As expected, differences werefound between the firm and foam conditions both with EO and EC inthe LV group suggesting that visual and sensorimotor challengesexist. In comparison, the normal group performed well across allconditions suggesting more stability. MTV and area measuresdiffered between the LV and normal group in the EO-firm conditionsuggesting that these variables might by predictors of balanceimpairment. A larger sample size is needed to determine test-retestreliability of each COP measure.Commercial Relationships: Pamela E. Jeter, None; Jialiang Gu,None; Judith E. Goldstein, None; Ava K. Bittner, None; GislinDagnelie, NoneSupport: Louise L. Sloan Research Grant Award, Lions VisionResearch Foundation, Wilmer Eye InstituteProgram Number: 2780 Poster Board Number: B0034Presentation Time: 8:30 AM - 10:15 AMLow vision and work opportunitiesJørn Kalleberg 1 , Irene Langeggen 2 . 1 NAV Buskerud, Drammen,Norway; 2 Buskerud University College, Kongsberg, Norway.Purpose: The aim is to enhance routines around any working lowvision patients enrolled at The Norwegian Labour and WelfareAssociation, Low vision clinic (NLW-LWC) and Kongbergcommunity, Buskerud, Norway. Data published by the NorwegianBlind Association reports 25-40 % of visual impaired are working.There is no literature referring to the role of NLW-LWC andcommunity cooperation to enhance low vision rehabilitation for thesepatients.Methods: Patients were recruited from a list of candidates given byeither the Kongsberg Community optometrist or the NLW-LWCoptometrist. The patients included were all eligible to low vision aidsaccording to Norwegian guidelines. All participants were asked andsigned the consent form.The interview of the subjects was based on aquestionnaire concerning general health, mobility, work situation, useof visual aids and their experience with visual rehabilitation.Results: Age ranged from 32 - 59 years. Of 13 participants, six malesand four females were interviewed. One of the subjects had acongenital low vision condition. All subjects have completededucation at a high school level. One has a master degree. There is noone working in health care profession. Eight of ten works daily on acomputer, but only one uses Zoomtext.Visual acuity ranged from 0,15 - 1,2 (Snellen). Visual field wasreduced in nine of ten subjects. Six of ten used filter spectacles.Magnifier (4), near and reading magnifying spectacles (7) and thecomputer (7) were the prefered low vision aids. Seven subjects have afull time position.Neither had experienced a systematic approach to their low vision©2013, Copyright by the Association for Research in Vision and Ophthalmology, Inc., all rights reserved. Go to iovs.org to access the version of record. For permissionto reproduce any abstract, contact the ARVO Office at arvo@arvo.org.