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Introduction: Retinal vein occlusion presents as an acute, painless and unilateral sight loss. We report two cases of retinal vein occlusion (CRVO) in which the etiology was unusual., Case Reports: Case 1. A 54-year-old woman without any significant past medical history presented with an acute loss of vision. Medical history taking revealed the practice of yoga with headstand posture like "Sirsana". Case 2. A 35-year-old woman presented with an acute loss of vision related to a retinal vein occlusion. The investigation found prolonged and repeated vomiting the days before the retinal vein occlusion., Conclusion: Cardiovascular assessment is recommended in the investigation of CRVO. Furthermore, especially in young patients, a situation causing an increase of intraocular pressure as the practice of yoga with taking reverse "head down" body positions or even repeated vomiting efforts may be the cause of slower circulation of blood flow in the retinal veins., (Copyright © 2018 Société Nationale Française de Médecine Interne (SNFMI). Published by Elsevier Masson SAS. All rights reserved.)

Objectives: Hepatitis B vaccination has been proven to be effective and well-tolerated. Certain neurological, ocular or systemic complications have, however, been reported to be induced by the vaccine. Clinicians should be aware of exceptional ocular complications., Clinical Report: Four patients under 50 years of age developed occlusion of the central vein of the retina after vaccination with recombinant hepatitis B vaccine. None of the classical causes of occlusion of the central vein of the retina could be evidenced., Discussion: Several pathophysiological hypotheses have been proposed to explain these ocular manifestations after vaccination: role of immunocomplexes, antigenic cross-reactions, role of immediate hypersensitivity, simulation of a pathogenic lymphocyte repertoire. None of these hypotheses is entirely satisfactory. It is important however to emphasize the need for a complete general evaluation, including an ophthalmological examination in the presence of unexplained ocular manifestations following hepatitis B vaccination.

Résumé Introduction Nous rapportons deux cas d'occlusion de la veine centrale de la rétine (OVCR) d'étiologie inhabituelle. Observations Cas 1. Une femme de 54 ans présentait une baisse de l'acuité visuelle brutale en rapport avec une OVCR. L'interrogatoire rapportait la pratique régulière du yoga avec des positions inversées du corps, comme celle du « chien tête en bas » encore appelé « Sirsana ». Cas 2. Une patiente de 35 ans présentait une baisse l'acuité visuelle brutale, pour laquelle le diagnostic d'OVCR était retenu. L'interrogatoire permettait de mettre en évidence des efforts de vomissements prolongés et répétés les jours précédents l'OVCR. Conclusion À côté du bilan cardiovasculaire recommandé dans le bilan d'une OVCR, il faut rechercher, une situation entraînant une augmentation de pression intraoculaire comme la pratique du yoga avec la prise de positions inversées du corps « tête en bas » ou encore les efforts de vomissements répétés. Abstract Introduction Retinal vein occlusion presents as an acute, painless and unilateral sight loss. We report two cases of retinal vein occlusion (CRVO) in which the etiology was unusual. Case reports Case 1. A 54-year-old woman without any significant past medical history presented with an acute loss of vision. Medical history taking revealed the practice of yoga with headstand posture like "Sirsana". Case 2. A 35-year-old woman presented with an acute loss of vision related to a retinal vein occlusion. The investigation found prolonged and repeated vomiting the days before the retinal vein occlusion. Conclusion Cardiovascular assessment is recommended in the investigation of CRVO. Furthermore, especially in young patients, a situation causing an increase of intraocular pressure as the practice of yoga with taking reverse "head down" body positions or even repeated vomiting efforts may be the cause of slower circulation of blood flow in the retinal veins. [ABSTRACT FROM AUTHOR]