Bagolini striated lenses

Bagolini striated lenses are plano lenses with fine parallel striations that turn a spotlight into a line image at 90° to the striations.¹ Bagolini devised the test to assess retinal correspondence and suppression under conditions close to natural seeing. The lenses do not change accommodation, and the striations barely alter acuity or the perception of space.²

The patient wears any refractive correction and fixates a small light through lenses usually set at 45° and 135°, at 6 m and again at 33 cm.^1,2 A symmetrical cross centered on the light indicates binocular single vision or harmonious anomalous retinal correspondence, and the cover test separates the two because a small heterotropia appears when correspondence is anomalous.¹ A single streak indicates suppression, a gap in one streak indicates a foveal suppression scotoma, and displaced streaks indicate heterotropia with normal correspondence.^1,2