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TRIAL CASES, FRAMES AND REFRACTOR HEADS
Late 20th c.
overall: 128 mm
Triple drop cell trial frame. Semi-adjustable. Light grey plastic front including straight metal bridge with mechanism for increasing the pupillary distance. Half oval eyes bearing black and silver-coloured scales, marked 0-18. Thin straight metal drop-end sides, adjustable for length, with black plastic end covers.
Gift of Mrs Margeurite Knight via Mr and Mrs Thompson, 2014