Perception of Purkinje vessel shadows and foveal granular pattern as a measure of potential visual acuity

Abstract

Perception of the Purkinje vessel shadows does not distinguish between good and poor retinal acuity, whereas nonperception of the vessel shadows strongly suggests poor acuity. Perception of the foveal granular pattern, on the other hand, provides a positive indication of good retinal acuity and will likely prove to be predictive of good vision after removal of significant media opacity.

Comparison of visual acuity measurements and Purkinje's vessel shadow perception for prediction of postoperative visual acuity in different ophthalmological diseases

“…Testing of Purkinje's vessel shadow perception is very useful in all cases of severe media opacity, such as mature cataract or vitreous haemorrhage (Dimitrakos 1999; Murillo‐Lopez et al. 2000).…”

The entoptic view of the retinal vessels

“…Entoptic perception of the vascular tree was sometimes used clinically to determine potential visual acuity, where nonperception of the vessels strongly suggested poor acuity (Murillo‐Lopez et al. 2000).…”

“…Entoptic perception of the vascular tree was sometimes used clinically to Evans (1938). determine potential visual acuity, where nonperception of the vessels strongly suggested poor acuity (Murillo-Lopez et al 2000). The test correctly identified 91% of eyes with good macular function, and if no vascular pattern was seen, it was probable that the eye had poor macular function (Talbot et al 1992).…”

Vorhersage des postoperativen Visus bei Cataracta matura und Cataracta myopica alta

“…Neben verschiedenen Sehscharfemessungen (Nah-and Femvisus) kann insbesondere vom Laserinterferenzvisus eine validere Aussage erwartet werden, da sich diese Messung bei fortgeschrittenen Katarakten and Nachstaren bewahrt hat [2-3, 7, 9]. Aber auch die Wahrnehmung der Aderfigur kann einen guten Hinweis 271 auf die funktionelle Leistungsfdhigkeit der Retina geben [8]. In dieser Studie soil versucht werden, die Wertigkeit dieser relativ einfach vor der Phakoemulsifikation erfassbaren Parameter zu vergleichen.…”

“…Hier kommt nun die Purkinje'sche Aderfigur zu recht guten Prognosewerten [8]. Bei positiver Angabe hat der Patient eine 3-fach hohere relative Chance, einen Visus besser als 0,32 zu erzielen als unterhalb dieser Marke zu bleiben.…”