Color Dissociation Artifacts in Double Maddox Rod Cyclodeviation Testing

Simons, Kurt; Arnoldi, Kyle; Brown, Mary H.

doi:10.1016/s0161-6420(94)31086-4

Cited by 28 publications

(11 citation statements)

References 12 publications

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“…The DMRT was performed using 2 red Maddox rods to avoid artefactual cyclodeviation measurements with a red glass for one eye and a white for the other,10 approximately 30° counterclockwise from the vertical position in the trial frame. Each patient was asked to open both eyes simultaneously and to slowly rotate the rod clockwise until the two lines were horizontally parallel.…”

Section: Methodsmentioning

confidence: 99%

Comparison of subjective and objective torsion in patients with acquired unilateral superior oblique muscle palsy

Roh

Hwang

2011

British Journal of Ophthalmology

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Section: Methodsmentioning

confidence: 99%

Comparison of subjective and objective torsion in patients with acquired unilateral superior oblique muscle palsy

Roh

Hwang

2011

British Journal of Ophthalmology

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“…Testing for subjective torsion was done with the double Maddox rod test before and after surgery using a white and red Maddox rod. Because almost all of the patients had surgery before it was known that the use of a white Maddox rod caused a color dissociation artifact in which the eye perceiving the white line will tend to be viewed as having no torsion, 24 the subjective torsion was analyzed as the total torsional disparity between the 2 eyes without attention to which eye was subjectively torted. Objective torsion was determined in each eye separately before and after surgery using fundus photography and analyzed using a template overlay in the manner previously described.…”

Section: Methodsmentioning

confidence: 99%

Vertical Rectus Surgery for Knapp Class II Superior Oblique Muscle Paresis

Kushner

2010

Arch Ophthalmol

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Objective: To evaluate the efficacy of treating Knapp class II superior oblique muscle palsy with 7-mm nasal transposition of the ipsilateral inferior rectus muscle combined with recession of the contralateral inferior rectus muscle when the primary position hypertropia is 10 prism diopters (PD) or less.Method: A retrospective review of 8 consecutive patients with superior oblique muscle paresis who had nasal transposition of the inferior rectus muscle in the paretic eye and recession of the inferior rectus muscle in the nonparetic eye. Ocular motility, including objective and subjective torsion, were evaluated before and after surgery.Results: The mean (SD) preoperative hypertropia was 5 PD (1.5) and 13.1 (3.6) PD in the primary position and downgaze, respectively. After surgery the mean (SD) hypertropia was 1.25 (1.0) and 3.25 (1.3) PD in the primary position and downgaze, respectively. The mean (SD) subjective excyclotropia decreased from 6.6°(1.3°) preoperatively to 0.5°(0.9°) after surgery, and there was a mean (SD) objective decrease in the excyclotorsion of the paretic eye by 7.8°(1.4°). All patients were diplopic before surgery and asymptomatic after surgery.Conclusion: Treatment with 7-mm nasal transposition of the ipsilateral inferior rectus muscle combined with recession of the contralateral inferior rectus muscle can effectively treat Knapp class II superior oblique muscle palsy when the primary position hypertropia is 10 PD or less.

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“…An indirect way consists of analysing the excursion of the blind spot on the Goldman perimetry. Torsion can also be assessed using Krats torches during a coordimetric Lancaster red-green test, with Harms’ tangent scale, with Bagolini’s striated glass or the double Maddox rod [ 6 , 7 ]. All of these tests require a normal binocularity and a perfect cooperation of the subject.…”

Section: Introductionmentioning

confidence: 99%

Reliability and reproducibility of disc-foveal angle measurements by non-mydriatic fundus photography

Jeune¹,

Chebli²,

Léon³

et al. 2018

PLoS ONE

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PurposeAbnormal torsion could be associated with cyclovertical strabismus, but torsion measurements are not reliable in children. To assess an objective fundus torsion evaluation in a paediatric population, we used Non-Mydriatic Fundus photography (NMFP) in healthy and cyclovertical strabismus patients to evaluate the disc-foveal angle over time and observers.MethodsWe used a retrospective set of NMFP including 24 A or V-pattern strabismus and 27 age-matched normal children (mean age 6.4 and 6.7 years respectively), taken during 2 distinct follow-up consultations (separated by 251 and 479 days respectively). Each disc-foveal angle measurement (from which the ocular torsion can be assessed) was performed by 5 different observers, using graphical software and based on reproducible fundus anatomical marks. Statistical analysis was performed with a multivariate ANOVA using group, time and observers as factors, in addition to intraclass coefficient correlation (ICC) to assess measurement reproducibility.ResultsA significant difference of disc-foveal angle measures was observed between groups (p<0,001): 18.73° (SD = 6.42), -3,25° (SD = 5.51) and 6,89° (SD = 4,41) respectively for V-pattern, A- pattern and normal subjects. Neither observers (F = 0,2028 p = 0,9369) nor time between 1st and 2nd NMFP (F = 0,6312 p = 0,4271) seem to influence the measure of disc-foveal angle. The evaluation of disc-foveal angle was very reproducible between observers (ICC>0,97).ConclusionAbnormal amount of objective torsion could be associated with alphabet-pattern strabismus. Disc-foveal angle evaluation by NMFP in a children population appears as a non-invasive, reliable and reproducible method.

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Color Dissociation Artifacts in Double Maddox Rod Cyclodeviation Testing

Cited by 28 publications

References 12 publications

Comparison of subjective and objective torsion in patients with acquired unilateral superior oblique muscle palsy

Comparison of subjective and objective torsion in patients with acquired unilateral superior oblique muscle palsy

Vertical Rectus Surgery for Knapp Class II Superior Oblique Muscle Paresis

Reliability and reproducibility of disc-foveal angle measurements by non-mydriatic fundus photography

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