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Letters
Black intraocular lenses: near infra-red light transmission may risk treatment failure
  1. Imran H Yusuf1,2,
  2. Stuart N Peirson1,
  3. C K Patel2
  1. 1Nuffield Laboratory of Ophthalmology, Oxford University, John Radcliffe Hospital, Oxford, Oxfordshire, UK
  2. 2The Oxford Eye Hospital, John Radcliffe Hospital, Oxford, Oxfordshire, UK
  3. Correspondence to Dr C K Patel, The Oxford Eye Hospital, John Radcliffe Hospital, Oxford OX3 9DU, UK; ckpatel@btinternet.com

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Intractable diplopia occurs in approximately 0.8% of patients following strabismus surgery, with considerable detriment to visual quality of life. Long-term therapeutic occlusion is required to permit functional vision.

Black intraocular lens (IOL) implantation is an effective therapeutic option associated with high rates of postoperative satisfaction.1 Black IOL implantation entails a cost to the public sector or patient but this may be offset by long-term clinical and social benefits and fewer hospital visits.

A distinction has emerged between black IOLs that transmit near-infrared (NIR) light and those producing total occlusion of all wavelengths of light (figure 1).2 Morcher black IOLs transmit NIR light exponentially from 720 nm, with 100% transmission over 820 nm, permitting posterior segment imaging with scanning laser ophthalmoscopy (SLO) and optical coherence tomography (OCT).2 This property offers a distinct clinical advantage; SLO/OCT may detect life-threatening retinal and optic nerve diseases, such as choroidal melanoma.2

Figure 1

Black IOLs in clinical use. Near-infrared (NIR)-transmitting black IOLs: (A) 85F PMMA IOL (6 mm optic, 12 mm overall), (B) 6S PMMA IOL (10 mm optic, 12 mm overall), (C) 80D …

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