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Recent decades have seen UK optometrists shift away from monocular instruments towards binocular indirect techniques both for routine fundus examination and, in particular, where an enhanced view is required. Formerly the staple instrument of the community optometrist, direct ophthalmoscopy (DO), has given ground to slit-lamp binocular indirect ophthalmoscopy (SBIO) as the technique of choice. Despite the fact that optometrists have embraced the advantages of binocular techniques, head-mounted binocular indirect ophthalmoscopy (HBIO) remains an instrument more associated with ophthalmology than optometry. This article aims to review the design and use of HBIO while the second article will be highlighting indications for its use in optometric practice.
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