geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Effect of dichoptic adaptation on frequency-doubling perimetry


, : Effect of dichoptic adaptation on frequency-doubling perimetry. Optometry and Vision Science 79(2): 88-92

In frequency-doubling technology (FDT) perimetry, the second eye tested has reduced sensitivity. We investigated the cause of this sensitivity reduction. Contrast sensitivity was measured for frequency doubling (0.25 cpd, 25 Hz) and nonflickering (4 cpd) gratings, arranged similarly to the targets in the FDT perimeter (Welch Allyn, Skaneateles Falls, NY, and Humphrey Instruments, San Leandro, CA). Various test orders were examined. Frequency-doubling (FD) sensitivity was reduced (0.15 log) in the second eye. A similar reduction occurred when first and second eye gratings were oriented orthogonally, suggesting that dichoptic contrast adaptation was not the cause. FD sensitivity was little affected after testing with nonflickering gratings, suggesting that fatigue effects were small. Sensitivity was reduced when testing was performed after 5 min of opaque occlusion. The use of a translucent occluder eliminated the reduction in sensitivity in the second eye. We confirm the presence of reduced sensitivity in the second eye tested with FD perimetry and find that it is caused by delayed light adaptation post-occlusion.

US$29.90

PMID: 11868852


Other references

Indolfi, G.; Bartolini, E.; Azzari, C.; Becciolini, L.; Moriondo, M.; de Martino, M.; Resti, M., 2008: Intrafamilial transmission of hepatitis C virus: infection of the father predicts the risk of perinatal transmission. The aims of the present study were to evaluate in a cohort of mothers infected with hepatitis C virus (HCV) the prevalence of HCV infection of their sexual partners, the influence of infection of the partners on perinatal transmission, and whether...

Lefort-Buson, M.; Guillot-Lemoine, B.; Dattee, Y., 1987: Heterosis and genetic distance in rapeseed brassica napus l. crosses between european and asiatic selfed lines. Different types of F1 hybrids from the same and different geographic origins were studied. European and Asiatic inbred lines were hand crossed in three ways: a diallel design among European lines (European group), a diallel design among Asiatic li...

Fernandez H.; Mclean W.; Pardue G.; Barnes R.; Spruill J., 1975: New system for a 2 speed electro encephalograph with an auditory device for diminishing the length of seizures. Aviation Space & Environmental Medicine 46(5): 743-744

Vora, S.; Iyer, P.D.; Bhagat, M.P.; Patel, J.C.; Mehta, B.C., 1975: Incidence of hemoglobin Barts in cord blood samples. Indian Journal of Medical Sciences 29(8-9): 205-207

Wlodek, C.; Ali, F.R.; Lear, J.T., 2013: Use of photodynamic therapy for treatment of actinic keratoses in organ transplant recipients. Solid organ transplant recipients are predisposed to actinic keratoses (AK) and nonmelanoma skin cancers, owing to the lifelong immunosuppression required. Today, increasing numbers of organ transplants are being performed and organ transplant rec...

Slordal L.; Warren D.J.; Moore M.A.S., 1989: Effect of recombinant murine tumor necrosis factor on hemopoietic reconstriction in sublethally irradiated mice. Intravenous bolus administration of a single 2-.mu.g dose of murine rTNF-.alpha. to BALB/c mice 20 h before sublethal total-body irradiation (7.5 Gy) conferred significant protection against radiation-induced leukopenia. Murine rTNF-.alpha. admini...

Bressel, Eadric, 2001: The influence of ergometer pedaling direction on peak patellofemoral joint forces. Objective. To compare patellofemoral joint forces during forward pedaling and reverse pedaling on a bicycle ergometer. Design. Experimental within-subject design. Background. Clinicians addressing patellofemoral pain syndrome often strive to achie...

Kasper, K., 2000: Highlights from WM2K. Health Physics 79(2): 118-118

Conyers, M.K.; Poile, G.J.; Oates, A.A.; Waters, D.; Chan, K.Y., 2011: Comparison of three carbon determination methods on naturally occurring substrates and the implication for the quantification of soil carbon. Soil Research 49.1: 27-33

Mitchell C.M., 1970: Determination of the lattice parameters and the mosaic structure of a crystal using Fourier unfolding. Pages 49 1970