Dark refraction shift with allowance for astigmatism
African Vision and Eye Health
| Field | Value | |
| Title | Dark refraction shift with allowance for astigmatism | |
| Creator | Gillan, W.D.H. | |
| Description | Purpose: To show that the dark refraction shift (dark focus) is a more complicated phenomenon than implied when presented as spherical. Methods: Fifty autorefractor measurements of refractive state of the right eye were obtained in light and dark conditions. Multivariate methods were used to analyze the data and stereo-pair scat-ter plots, polar meridional profiles and other means of presenting results are used to show important characteristics of the dark refraction shift. Results: The complexity of the dark refrac-tion shift is indicated by stereo-pair scatter plots showing the amount of stigmatic and antistigmatic variation that occurs in light and dark conditions. The mean dark refraction shift is presented in a complete manner including all three components of refractive state. The greater variance and covari-ance under dark conditions is clearly shown by the term-by-term dark-light variance-covariance ratio and polar profiles of variance and covariance.Conclusions: The dark refraction shift is a more complicated phenomenon than implied by representations as purely spherical in nature. | |
| Publisher | AOSIS | |
| Date | 2005-12-19 | |
| Identifier | 10.4102/aveh.v64i1.206 | |
| Source | African Vision and Eye Health; South African Optometrist: Vol 64, No 1 (2005); 26-30 2410-1516 2413-3183 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://avehjournal.org/index.php/aveh/article/view/206/174
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