Ein neues Dynamometer

Baurmann, M.

doi:10.1007/bf01890496

Cited by 6 publications

(3 citation statements)

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“…A force needs to be applied to the eye to induce a rise in intraocular pressure (IOP), which elicits pulsation of the retinal vessels on or near the optic disc. Different instruments have been invented: the first one was developed by Bailliart [ 1 ]; the impression dynamometer was developed by Müller [ 2 ]; and the concave lens dynamometer [ 3 ], the angiotonometer [ 2 , 4 ], the suction cup dynamometer [ 5 ] and the contact lens dynamometer (CLD) have been developed [ 6 ]. With the exception of the CLD these instruments were calibrated in arbitrary units that had to be converted into intraocular pressure units.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the retinal venous pressure with a new instrument in healthy subjects

Stodtmeister

Wetzk

Herber

et al. 2021

Graefes Arch Clin Exp Ophthalmol

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Background The retinal venous pressure (RVP) is a determining factor for the blood supply of the retina as well as the optic nerve head and until recently has been measured by contact lens dynamometry (CLD). A new method has been developed, potentially offering better acceptance. The applicability and the results of both methods were compared. Methods The type of this study is cross sectional. The subjects were 36 healthy volunteers, age 26 ± 5 years (mean ± s). Tonometry: rebound tonometer (RT) (iCare). The measurements were performed during an increase in airway pressure of 20 mmHg (Valsalva manoeuvre). Principle of RVP measurement: the central retinal vein (CRV) is observed during an increase of intraocular pressure (IOP) and at the start of pulsation, which corresponds with the RVP. Two different instruments for the IOP enhancement where used: contact lens dynamometry and the new instrument, IOPstim. Principle: a deflated balloon of 8 mm diameter—placed on the sclera laterally of the cornea—is filled with air. As soon as a venous pulsation occurs, filling is stopped and the IOP is measured, equalling the RVP. Examination procedure: randomization of the sequence: CLD or IOPstim, IOP, mydriasis, IOP three single measurements (SM) of the IOP with RT or of the pressure increase with CLD at an airway pressure of 20 mmHg, 5 min break, IOP, and three SM using the second method at equal pressure (20 mmHg). Results Spontaneous pulsation of the CRV was present in all 36 subjects. Pressures are given in mmHg. IOP in mydriasis 15.6 ± 3.3 (m ± s). Median RVP (MRVP)) of the three SM: CLD/IOPstim, 37.7 ± 5.2/24.7 ± 4.8 (t test: p < 0.001). Range of SM: 3.2 ± 1.8/2.9 ± 1.3 (t test: p = 0.36). Intraclass correlation coefficient (ICC) of SM: 0.88/0.83. ANOVA in SM: p = 0.48/0.08. MRVP CLD minus MRVP IOPstim: 13.0 ± 5.6. Ratio MRVP CLD/MRVP IOPstim: 1.56 ± 3.1. Cooperation and agreeability were slightly better with the IOPstim. Conclusion This first study with the IOPstim in humans was deliberately performed in healthy volunteers using Valsalva conditions. As demonstrated by ICC and ANOVA, reproducible SM can be obtained by both methods and the range of the SM does not differ greatly. The higher MRVP in CLD could be explained by the different directions of the force vectors.

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Section: Introductionmentioning

confidence: 99%

Measurement of the retinal venous pressure with a new instrument in healthy subjects

Stodtmeister

Wetzk

Herber

et al. 2021

Graefes Arch Clin Exp Ophthalmol

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“…The continuation of this work was published by Weigelin, Iwata and Halder [1964], In 1970, N iesee gave a brief review of our present knowledge on ophthalmodyna mometry. Colloquia on the subject were held in 1951. In 1958 the Hispano-American, in 1961 the Belgian and in 1964 the Japanese Ophthalmological Societies dealt with ophthalmodynamometry as the main topic of their Meetings.…”

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confidence: 99%

“…Baurmann's [1951Baurmann's [ , 1955 instrument works on the principle of applanation. Applanation dynamometry can also be performed with the aid of the Mackay-Marg electronic tonometer.…”

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confidence: 99%