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Biomedical subjects

S Mennel

Publications and source records attributed to S Mennel.

5 recordsLinked to original sources
PubMed2005

[Transient visual decrease after photodynamic therapy].

BACKGROUND: After photodynamic therapy (PDT) some patients complain about a transient decrease of visual acuity during the first postoperative week. PATIENTS AND METHODS: Prior to and at 2 days and 1 week after PDT the following parameters were measured: (1) best corrected visual acuity (VA), (2) changes in refraction, and (3) A scan ultrasound biometry was carried out. Linear and 3-D optical coherence tomography was performed in three cases. A total of 53 PDT treatments were followed-up in 24 patients. RESULTS: Comparison of the pre- and postoperative refraction demonstrated a mean hyperopic shift of +0.35 diopters (dpt) in 43% of treatments (23/53) on the second postoperative day. The hyperopic shift reduced to +0.07 dpt after 1 week. The best corrected VA remained stable or was even better in 68% (36/53) on the second postoperative day. A decrease in VA could be noticed in 32% (17/53) at this time which declined to 23% (12/53) after 1 week. Measurement of the cornea-retina distance using A-scan ultrasound biometry disclosed a mean axial reduction of 0,13 mm at the second postoperative day. This correlates closely with an average hyperopic shift of 0,35 dpt. OCT examination disclosed a transient macular edema in the treated retinal areas. CONCLUSIONS: A transient hyperopic shift can be measured in 43% on the second postoperative day. The subjective decrease in visual acuity measured over the postoperative days was mainly due to a transient hyperopic shift in our patients. OCT findings disclosed a transient macular edema of the retina treated with PDT, which may relate to a hyperopic shift.

Aged↗
PubMedDate not supplied

Acute commotio retinae determined by cross-sectional optical coherence tomography.

PURPOSE: To demonstrate the cross-sectional anatomy in acute commotio retinae. METHODS: A 27-year-old male with unilateral decreased vision after acute blunt ocular trauma, was examined by optical coherence tomography (OCT). RESULTS: Visual acuity was 20/20 OD and 20/50 OS. Fundus examination OS demonstrated a mild edema in the papillomacular and foveal area. OCT confirmed a separation of the neurosensory retina and the retinal pigment epithelium (RPE). The thickness of the retina was normal and the contour of the foveola intact. The uncommon hyperreflective band at the outer retina may present the traumatic disruption of photoreceptors. CONCLUSIONS: In vivo investigations by OCT confirmed previous histological studies, a commotio retinae consists a disruption and fragmentation at the level of the foveal photoreceptor segments and RPE.

Acute Disease↗