Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Does the Howard-Dolman really measure stereoacuity?

W L Larson

    American Journal of Optometry and Physiological Optics
    |November 1, 1985
    PubMed
    Summary

    This study compared the Howard-Dolman (H-D) test with the original Howard test (H) for measuring stereoacuity. Thirty-four subjects were tested using the same automated device. Four methods were used to relate H-D results to stereoacuity, but none matched the H's accuracy. The H-D constant error was also not related to aniseikonia. The researchers suggest the H-D may not be a reliable test. These findings challenge the clinical use of the H-D method. The original Howard test appears to be more accurate for measuring depth perception.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Employment-seeking experiences of residents in 1996: a window into the neurology marketplace.

    Neurology·2000
    Same author

    Collet-Sicard syndrome mimicking neuralgic amyotrophy.

    Muscle & nerve·1997
    Same author

    Relationships between motor-unit number estimates and isometric strength in distal muscles in ALS/MND.

    Journal of the neurological sciences·1996
    Same author

    Mechanics of medicine need changing.

    Michigan medicine·1996
    Same author

    Foot drop as a harbinger of aortic occlusion.

    Muscle & nerve·1995
    Same author

    Disabled stereopsis may be the norm among well-educated people.

    Medical hypotheses·1995

    Area of Science:

    • Clinical audiology
    • Visual perception research
    • Ophthalmic testing methods

    Background:

    Stereoacuity testing is a key method for evaluating depth perception. Prior research has shown that multiple techniques exist for measuring this ability. The Howard-Dolman (H-D) test is a widely used adaptation of the original Howard test (H). However, uncertainty remains about whether the H-D provides accurate measurements. No prior work had resolved the discrepancy between the two methods. This gap motivated a direct comparison of the H-D and H. The original test is known to produce reliable stereoacuity values. The H-D, in contrast, has not been thoroughly validated. This uncertainty raises concerns about its clinical and scientific utility.

    Purpose Of The Study:

    The goal of this study was to compare the Howard-Dolman test with the original Howard test. Researchers wanted to determine if the H-D yields results similar to the H. They focused on stereoacuity measurements in a controlled setting. The study aimed to assess the validity of the H-D as a clinical tool. A key question was whether the H-D could reliably measure depth perception. The researchers also examined the relationship between H-D constant error and aniseikonia. They sought to clarify if the H-D is a suitable alternative to the H. This comparison is essential for ensuring accurate diagnostic outcomes.

    Keywords:
    stereoacuity testingHoward-Dolman comparisondepth perception measurementclinical ophthalmology

    Frequently Asked Questions

    The Howard-Dolman is a modified version of the original Howard test. The study found the H-D does not produce comparable stereoacuity results.

    Thirty-four subjects were tested using both the Howard-Dolman and original Howard tests.

    The same automated tester was used to ensure consistency and eliminate device-related variability.

    Aniseikonia refers to unequal image sizes in the two eyes. The study found no link between H-D constant error and aniseikonia.

    Related Experiment Videos

    Main Methods:

    Thirty-four subjects participated in the study. Each subject underwent both the H-D and H tests using the same automated stereoacuity tester. The device was programmable and fully automated. Researchers recorded the results from each test separately. Four different methods were used to relate H-D findings to stereoacuity. These methods included various statistical and interpretive approaches. The same subjects were tested to ensure consistency. The comparison was conducted in a controlled experimental environment.

    Main Results:

    The study found that none of the four methods produced H-D results comparable to the H. The original test consistently yielded reliable stereoacuity values. The H-D, however, showed significant discrepancies. The researchers observed a lack of correlation between the two tests. The H-D constant error was also not related to aniseikonia. This suggests the H-D may not be a valid measure of stereoacuity. The findings indicate the H-D is not as accurate as the H. These results challenge the clinical use of the H-D method.

    Conclusions:

    The authors suggest the H-D may be of questionable value for clinical and scientific applications. The study shows the H-D does not produce results similar to the H. The four methods tested failed to establish a valid relationship. The H-D constant error was not linked to aniseikonia. The researchers propose the H-D may not be a reliable test. The findings support the continued use of the original Howard test. The H-D appears to lack the accuracy required for clinical use. These conclusions are based on the observed discrepancies in test outcomes.

    Four different methods were used to relate H-D findings to stereoacuity, but none were comparable to the H.

    The authors suggest the H-D may be of questionable worth for clinical and scientific use.