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Biomedical subjects

E Alexandridis

Publications and source records attributed to E Alexandridis.

At least 55 records · Page 3Linked to original sources
PubMed1980

Recovery from macular photostress and slow retinal potentials in cured retinal detachment.

After successful surgery for retinal detachment, a series of functional tests was performed, which primarily concerned the contact between photoreceptors and pigment epithelium. Even several months after reattachment the EOG still remained lower than in the fellow eye, when the macula was involved. If maximal visual acuity was reached with a formerly detached retinal area, the photostress recovery time was found to be delayed. The dc-coupled ERG showed distinct impairment of the c-wave in the eye with the reattached retina.

Electrooculography↗
PubMed1979

[Disturbances of the pupil reflex associated with lesions of the upper visual pathway (author's transl)].

In six patients with ischemic lesions of the visual pathways above the lateral geniculate body, the pupil light reflex was investigated under perimetric conditions. The size of the lesions--in four cases caused by lateralized cerebral infarction, in two cases by complicated migraine attacks--was certified by neurological examination and by angiography or computerized tomography respectively. The recordings were done with a portable pupillograph measuring the infrared light reflected from the iris. A Tübinger perimeter served as stimulator. All patients except one, whose visual fields recovered quickly and completely, showed parallel tracings concerning the sensory and the pupillographic profiles, in the older lesions as well as in the recent ones.

Adult↗
PubMed1979

[Recovery of rod and cone systems after retinal detachment surgery].

The paper reports on the threshold values for light perception of circumscript retinal areas for different adaptation levels in patients successfully operated for retinal detachment. The examinations were carried out by means of the Tübingen projection perimeter, using the method of static perimetry in a meridian containing an approximately equal area of healthy and of formerly detached retina. The main aim of this examination was to establish whether both retinal photoreceptor systems recover within the same time after the operation. There is various evidence that the restitutions of the rod and cone systems do not occur at the same time.

Humans↗
PubMed1977

[Frequency of the pupillary response following flicker stimuli (author's transl)].

Pupillary function was tested in 3 different age groups (20-30, 40-50, 60-70 years) of 8 patients each. The pupillary response was picked up by means of a portable IR-reflex-pupillometer, which registered the consensual pupillary light reflex in one eye, while the other eye was stimulated by flashes of different frequencies. Measurements were made of how many Hertz (Hz) the pupil dilated in the dark phases (intervals) between the flashes (flicker-fusion frequency). In the younger age group an average value of 3.15 Hz was obtained, the middle group fused at 2.89 Hz, the older group at 2.61 Hz. These differences are explained mainly by muscular and vascular degeneration of the iris.

Adult↗
PubMed1977

[Treatment of an orbital defect with an eye prosthesis with an electronically controlled eyelid, synchronous to the intact eye].

For the treatment of an orbital defect after exenteratio orbitae, an eye prosthesis with flexible upper eyelid was developed. The artificial eyelid moves synchronously with the natural contralateral upper eyelid by electronic control. The electric signal of a light barrier mounted on to a spectable frame in front of the intact eye is intensified and transmitted to an electromagnet. The electromagnet is located in the obturator prosthesis and lifts the artificial eyelid.

Electronics, Medical↗
PubMed1976

[Ektoprosthesis with a synchronically movable eyelid (author's transl)].

An ektoprosthesis with a synchronically movable, electronically controlled eyelid has been developed. A suitable trigger-signal is derived from the movement of the natural contralateral eyelid. The miniaturized electronic processing unit is intergrated into the spectracle frame. The artificial eyelid is moved by an electromagnet situated in the orbital cavity.

Adult↗
PubMed1975

[The influence of the eye prominence on the EOG potential level (author's transl)].

The influence of globe prominence on the electro-oculogram potential level was measured in patients with unilateral protrusio bulbi, myopia or hyperopia. The EOG potential level on the side with the more prominent globe was lower if the prominence was due to protrusion. If the prominence was due to myopia, the EOG potential was higher compared to the contralateral non-myopic eye. In hyperopic eyes the potential level was lower.

Adaptation, Ocular↗
PubMed1975

[The electro-oculogram in the early postoperative period following fistulizing operations (author's transl)].

EOGs were obtained from 2 groups of patients suffering from glaucoma chronicum simplex the day before surgery and 3, 5, 8, 11 and 14 days after trephining or fistulizing operation after Scheie. Though and peak potentials of the treated eyes were significantly less than those of the untreated fellow eyes five days after surgery. In addition on the 11. postoperative day after Scheie a second potential decrease was seen. The EOG-changes observed appear to reflect disturbances of the choroidal circulation after fistulizing operations.

Aged↗