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Pubmed for Handhelds

PUBMED FOR HANDHELDS

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  • Title: Direct image-creating aspheric lens for indirect ophthalmoscopy.
    Author: Chalam KV, Brar VS, Agarwal S.
    Journal: Ophthalmic Res; 2008; 40(2):94-7. PubMed ID: 18223302.
    Abstract:
    AIMS: To describe a compact handheld optical lens that creates a real, upright image of the fundus with indirect ophthalmoscopy. METHODS: The compound lens consists of three double aspheric lenses of variable dioptric power mounted coaxially in a plastic housing mount. Lens A and B are separated by a distance of 30.96 mm while lens B and C are 19.38 mm apart. The length of the optical system is 79.63 mm. RESULTS: The lens design provides an upright aerial image of the fundus between the lens and the observer compared to the real inverted image formed by conventional indirect lenses during indirect ophthalmoscopy. CONCLUSIONS: The direct image-creating aspheric lens provides an upright image of the fundus with binocular indirect ophthalmoscopy, thus eliminating the need for mental reorientation of an inverted image.
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