Abstract • A practical method for detecting in vivo cataracts has been developed using a commercially available slit-lamp camera and by utilizing a measuring grid photographic technique. The basis of the method is to photograph a series of slit-beam sections through a lens at varying angles to the optic axis. The areas of opacity show up as localized regions of light back-scatter where the opacities intersect the path of the beam. A set of measuring grids compensated for angle distortion have been prepared. These are superimposed on the appropriate photograph. By taking a sufficient number of sections through a cataractous lens, a tomographic representation of the opacities can be constructed using a lens map. An example of the procedure of three-dimensional mapping is presented using actual lens pictures. The photographic parameters used in this method are explained in detail. The method achieves the goals of ease of use, reproducibility, and applicability to research and clinical studies. References 1. Goldmann H: Biomicroscopy of the eye . Am J Ophthalmol 66:789-804, 1968. 2. Koby FE: Slit-lamp Microscopy of the Living Eye , ed 2. Philadelphia, Blakiston Co, 1930, p 31. 3. Brown N: Slit-lamp photography . Trans Ophthalmol Soc UK 89:397-408, 1969. 4. Brown N: An advanced slit-image camera . Br J Ophthalmol 56:624-630, 1972.Crossref 5. Brown N: Quantitative slit-image photography of the lens . Trans Ophthalmol Soc UK 92:303-317, 1972. 6. Brown N: The change in shape and internal form of the lens of the eye on accommodation . Exp Eye Res 15:441-459, 1973.Crossref 7. Brown N: The shape of the lens equator . Exp Eye Res 19:571-576, 1974.Crossref 8. Brown N: The change in lens curvature with age . Exp Eye Res 19:175-183, 1974.Crossref 9. Clark BAJ, Lowe RF: Slit-lamp measurement of anterior chamber geometry . Ophthalmologica 168:58-74, 1974.Crossref 10. Lowe RF, Clark BAJ: Posterior corneal curvature . Br J Ophthalmol 57:464-470, 1973.Crossref 11. Cinotti AA, Patti JC, Tanne E: Lens Abnormalities in an Aging Population . Jersey City, NJ, New Jersey College of Medicine and Dentistry, 1967. 12. Rossomondo RM, Wilson LA: Anterior pyramidal cataract . Arch Ophthalmol 90:339, 1973.Crossref 13. Sigelman J, Trokel SI, Spector A: Quantitative biomicroscopy of lens light back-scatter . Arch Ophthalmol 92:437-442, 1974.Crossref 14. Parker JA: Aspheric optics of the human lens . Can J Ophthalmol 7:168-175, 1972.
Archives of Ophthalmology – American Medical Association
Published: Nov 1, 1976