97th DOG Annual Meeting 1999
RETINOSCOPY ON ASPHERIC INTRAOCULAR LENSES (AIOL)
E. H. Roth, C. Hoffmann, H. Ludwig, W. Werner
Background: Retinoscopy usually is used to determine the refraction of the eye. More skilled, differential observations give information on variations of the image characteristics in different zones of the optical system and with that of the integral image quality. E.g. spherical lenses have different image characteristics in the marginal region in comparision to the region next to the optical axis. Therefore it may be assumed, that aspherical intraocular lenses (AIOL) will perform better with larger pupils than spherical IOL, which are commonly used until now. Beside theoretical calculations it is difficult to prove the advantages of implanted aspherical IOL, because the patient is not able to say, how he would see with the eye concerned if he would have got a conventional spherical IOL.
Methods: With aid of appropriate videocameras it is possible to record retinoscopial reflexes of the eye. This kind of recording is more suitable to the dynamics of retinoscopy than taking only a photografy. It offers an appropriate process to make repeated, intensiv and comparible analysis, without examining different patients at the same time or putting unnecessary heavy strain on them. The recorded reflexes give the opportunity of a visible documentation of irregularities of the optic system, e.g. eyes with keratokonus.
Results: The video shows the principal course of rays concerned with retinoscopy. Furthermore it can be seen by selected records of retinoscoped eyes, that the image characteristics of a patient´s eye with implanted asperical IOL are significantly more homogeneous compared to a commonly used sperical IOL.
Conclusions: The patient normally is not able to give reliable ratings of the improvement of vision with implanted aspherical IOL. Videorecording the dynamic retinoscopial reflexes directly on the operated eye is an appropriate procedure to rate the image quality and implizit with it the quality of vision. Also it can documentate and make comparible different observations of different patients made on different moments at different states.
Institute for Physiological Optics, Beethovenstr. 1, D-40233 Düsseldorf