Location of Achromatizing Pupil Position and First Purkinje Reflection in a Normal Population
| Autor: | Juan Tabernero, Pablo Artal, Antonio Benito, Pedro M. Prieto, Silvestre Manzanera |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Adult
Male medicine.medical_specialty genetic structures medicine.medical_treatment Visual Acuity Pupil law.invention Cornea Young Adult Cellular and Molecular Neuroscience Optical path Reference Values law Refractive surgery Ophthalmology Humans Medicine Blinking business.industry Aberrometry Corneal Topography Presbyopia Middle Aged medicine.disease Corneal inlay eye diseases Sensory Systems Purkinje images Reflection (mathematics) Achromatic lens Female sense organs business Follow-Up Studies |
| Zdroj: | Investigative Ophthalmology & Visual Science. 56:962-966 |
| ISSN: | 0146-0404 |
| DOI: | 10.1167/iovs.14-16108 |
| Popis: | PURPOSE Quality of vision in patients who have undergone corneal refractive surgery depends upon the optimal centration of the procedures used. The center of the pupil is used as a reference point in some corneal ablation procedures. The achromatic axis would be a more sensible option from an optical point of view, but it is not as readily detectable. As an alternative, other refractive techniques, like the small aperture corneal inlay for presbyopia correction, use the corneal reflex (first Purkinje image). To assess the relative position of these two marks, we developed a new instrument to simultaneously measure both the first Purkinje image (PI) and the intersection of the achromatic axis with the pupil plane. METHODS The apparatus records images of the pupil and the PI when illuminated with a circle of infrared light-emitting diodes. A second optical path allows determination of the achromatic axis by using a subjective method. Both the positions of the PI and the achromatic axis intersection are determined simultaneously. RESULTS A series of data were obtained in 48 eyes. The mean location of the achromatic point relative to the PI was [x = -0.05 ± 0.15 mm; y = 0.09 ± 0.18 mm]. Considered individually, in 55% of eyes, the distance between locations is less than 0.2 mm, and in 95% of eyes, distances are less than 0.4 mm. CONCLUSIONS On average, achromatic axis crossing of the pupil and PI locations coincides within measurement errors. Although there was some intersubject variability, differences in location were less than 0.6 mm in all measured eyes. |
| Databáze: | OpenAIRE |
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