Two-dimensional map of polar vector plots showing preferential orientation of collagen fibrils at 0.5 mm intervals over the flattened anterior specimen. (Broken annulus) Circumferential alignment of collagen is evident in the limbus. (Broken lines) Meridional fibril alignment at cardinal points in the anterior sclera, corresponding to rectus muscle insertion sites. (Arrow heads) Geometric equator of the eye globe. (Arrow) Localized meridional collagen alignment in equatorial sclera. Insets: equivalent data from a second eye, confirming the presence of highlighted features. Colour coding for vector plot scaling: orange (×1), red (×2), brown (×3), black (×4), green (×5), blue (×6), purple (×7).