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Biomedical subjects

Y Robert

Publications and source records attributed to Y Robert.

139 records · Page 8Linked to original sources
PubMed1982

Measurement of the optical density of the optic nerve head I: the pallor of the papilla in artificial ocular hypertension.

The pallor of the optic disc during acute raise of intraocular pressure can be shown on the negatives of orthochromatic film and is measured by a photoscanner. When raising intraocular pressure from normal values to ablut 40 mm Hg, ten young persons showed an increase in optical density from 0.28 log units +/- 0.04 SEM to 0.38 log units +/- 0.04 SEM. When raising IOP to 65 mm Hg, the optical density was 0.43 log units +/- 0.04; with 110 mm Hg the optical density was 0.44 log units +/- 0.04 SEM. Above values of 40 mm Hg IOP, the pallor does not remain constant but may also decrease in some cases. The higher the intraocular pressure, the more contradictory the response. The phenomenon may be shown on various parts of the rim simultaneously. The amount of maximum pallor is directly related to the value of optical density with normal intraocular pressure. After restoring IOP to normal values, optical density decreases again, the amount of decrease being related to initial value. The contradictory response with higher IOP may be due to autoregulation of the capillaries of the optic nerve head.

Humans↗
PubMed1982

Measurement of the optical density of the optic nerve head II: short-time fluctuations of the optical density of the nerve head.

The fluctuation of pallor with increasing IOP could be due to either insufficient reliability of the method or to an unrecognized pulsating phenomenon. A better arrangement should eliminate imperfection of the method. Coupling the release with the ECG should reveal a relationship to the arterial pulse rate. Neither condition could be demonstrated as the reason for the fluctuation. The connection of the fluctuation and its possible relationship to central venous pressure is discussed. The margin of error is shown, which is 9% on average.

Electrocardiography↗
PubMed1982

[Results of combined cataract/glaucoma operations (author's transl)].

In general the combined cataract/glaucoma operation is a good procedure for treating cataract and glaucoma simultaneously. The operation was performed in 157 eyes between 1976 and 1980. The mean IOP remained constant after surgery for a follow-up period of over three years on average. The review covered 136 eyes, of which 103 needed no therapy initially after the operation; now only 78 have good IOP without drug therapy. It seems that some time after the operation glaucoma therapy is needed again. The question arises whether it is better to perform a combined operation or to perform trabeculectomy first and cataract extraction later, or even if it is better to perform cataract extraction alone and continue with drug therapy for the glaucoma.

Cataract↗
PubMed1982

[Macrodacryocystography--a review of 232 cases].

During the last four years 232 macrodacryocystographies have been performed. The results are compared with the clinical evaluation of these patients. There are two groups of findings, simple stenosis on one side and anatomical abnormalities on the other side. The stenosis is mostly located before the lacrimal sac and most often involves the common canaliculus.--In the second part of the paper examples of alterations of the lacrimal apparatus show the value of the method in evaluating pathological anatomy.

Adolescent↗