ELLA LEGROS uses its know-how acquired in negatoscope production to complete its range with a large number of products aimed at specialists such as chiropodists, dentists, ophthalmologists, etc. Optometry Comprehensive range of visual acuity scales for near and far vision: MONOYER test, ARMAIGNAC test, etc. along with scales intended for children: Pigassou scale, DDASS scale, etc.