Abstract
A system for sequential colour video capture and analysis of lens opacities is described. A sensitive RGB (Red-Green-Blue) camera is coupled to a 486 DX2/66 IBM-compatible computer to obtain high-resolution images of cataracts. Vacuoles, retro-dots, suture opacities, wedge opacities, cortical and posterior subcapsular opacities and nuclear sclerosis can be digitised and subjected to various analysis systems and colour prints obtained. The size and number of vacuoles and opacities can be determined by selecting areas of interest, and line tracings of whole lens, isolated opacities or nuclear sclerosis can be separated by analysis into 16.8 million plus colour gradients. The Cataract Image Analysis System represents a precise and new digitised procedure for cataract documentation and may be of value in determining cataract progression and evaluation of medical therapy.
Similar content being viewed by others
Article PDF
References
Sparrow JM, Bron AJ, Ayliffe W, Sparrow JM, Hill AR . The Oxford clinical cataract classification and grading system. Int Ophthalmol 1986;9:207–25.
Hockwin O, Dragomirescu V, Laser H . Measurement of lens transparency and of its disturbance by densitometric image analysis of Scheimpflug photographs. Graefes Arch Clin Exp Ophthalmol 1982;219:255–62.
Brown NAP, Bron AJ, Ayliffe W, Sparrow JM, Hill AR . The objective assessment of cataract. Eye 1987;1:234–46.
Cotlier E, Fagadau W, Cicchetti DV . Method for evaluation of medical therapy of senile and diabetic cataracts. Trans Ophthalmol Soc UK 1982;102:416–22.
Chylack LT, White O, Tung WH . Classification of human cataractous change by the American co-operative cataract research group method. Staged simplification of cataract classification. Invest Ophthalmol 1984;25:166–73.
Chylack LT, Rosner B, Cheng HM, McCarthy D, Pennett M . Sources of variance in the objective documentation of human cataractous change with Topcon SL-45 and Neitz CTR retro-illumination photography and computerised image analysis. Curr Eye Res 1987;6:1831–40.
Mayer H, Irion KM . New approach to area image analysis of Scheimpflug photos of the anterior eye segment. Ophthalmic Res 1985;17:106–10.
Niesel von P . Spaltlampenphotographie mit der Haag-Streit Spaltlampe 900. Ophthalmologica (Basel) 1966;151:489–504.
Maclean H, Taylor CI . An objective staging for cortical cataract in vivo aided by pattern analysing computer. Exp Eye Res 1981;33:597–602.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Cotlier, E. Cataract image analysis system. Eye 13, 457–463 (1999). https://doi.org/10.1038/eye.1999.122
Issue Date:
DOI: https://doi.org/10.1038/eye.1999.122