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      Correlation between Contrast Sensitivity and Visual Acuity in Retinitis pigmentosa Patients

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          Abstract

          Purpose: High-contrast figures such as Landolt rings are insufficient to evaluate the function of the foveal cones of retinitis pigmentosa (RP) patients. We investigated the correlation between visual function as determined with Landolt rings and with the Vistech Contrast Sensitivity Function Test (VCTS) at various spatial frequencies, in addition to the Cambridge Low Contrast Grating (CLCG). Methods: The study included 30 retinitis pigmentosa patients (53 eyes). All patients were assessed with Landolt rings, the Vistech method, and the CLCG. We estimated the relative contribution of contrast sensitivity to visual acuity by VCTS at each spatial frequency and by CLCG by simple linear regression analysis. Results: The results of the regression analysis of VCTS at 1.5, 3.0, and 6.0 cycles/degree showed a significant correlation between Landolt rings and VCTS and between CLCG and VCTS that was strongest at 6.0 cycles/degree. There was no significant correlation between Landolt rings and VCTS or between CLCG and VCTS at 12.0 and 18.0 cycles/degree. Patients with a visual acuity of 20/25 and CLCG greater than 100 were divided into two groups according to their contrast sensitivity at 18.0 cycles/degree on VCTS. Conclusions: The VCTS at the highest frequency was useful for evaluating the foveal visual function in RP patients having good visual acuity with the Landolt rings. Thus, contrast sensitivity should be useful in detecting minute impairment or improvement of visual function in RP.

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          Progression of Visual Field Loss in Patients with Retinitis pigmentosa of Sporadic and Autosomal Recessive Types

          Purpose: We examined the natural course of patients with retinitis pigmentosa of the eight sporadic and five autosomal recessive forms over 5 years. Methods: We measured the areas of the visual fields by Goldmann perimetry using a digitizer and a computer software. Results: The visual field of V-4 isopters in 4 sporadic cases was approximately 200 cm 2 during 30 years after the initial examination, but decreased down to 40 cm 2 in the next 10 years. The visual field was reduced to half the normal field in 3 autosomal recessive cases early below the age of 25 years. In 4 sporadic and 2 autosomal recessive cases, the inferior temporal visual field was the widest at the onset of the disease, but exhibited the most severe loss. The superior nasal area was the narrowest initially, and showed the mildest progression. Conclusions: The visual field in retinitis pigmentosa is constricted age-dependently with severe loss of the inferior temporal visual area and mild damage to the superior nasal area.
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            Author and article information

            Journal
            OPH
            Ophthalmologica
            10.1159/issn.0030-3755
            Ophthalmologica
            S. Karger AG
            0030-3755
            1423-0267
            2002
            June 2002
            12 June 2002
            : 216
            : 3
            : 185-191
            Affiliations
            aDepartment of Ophthalmology, Takasaki National Hospital, Gunma, and bDepartment of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
            Article
            59627 Ophthalmologica 2002;216:185–191
            10.1159/000059627
            12065855
            © 2002 S. Karger AG, Basel

            Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

            Page count
            Figures: 2, Tables: 4, References: 24, Pages: 7
            Categories
            Original Paper · Travail original · Originalarbeit

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