EnChroma Kittredge Sunglasses - Color Blind Glasses Metal frame Enchroma Sunglass Lens: Medium density, plastic lens Proprietary color-enhancing spectral filter. Lens width: 57 millimeters Lens height: 40 millimeters Bridge: 16 millimeters Arm: 145 millimeters Frame fit: Adult regular Multiple colors Sunglass Lenses Anti-reflection coated for maximum optical clarity. Hydrophobic coating: easy to clean.