Magnification characteristics of the Optical Coherence Tomograph STRATUS OCT 3000

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
Ana Sanchez-CanoFrancisco M Honrubia

Abstract

To evaluate the magnification characteristics of an Optical Coherence Tomograph (STRATUS OCT 3000) used to measure optic disc size. An eye model was designed, built and used to measure changes in the magnification of the Optical Coherence Tomograph (OCT) with variation in the axial length of the eye and OCT correction lenses. Theoretical calculations using ray-tracing were used to compare the experimental and theoretical results. OCT-performed fundus measurements have a magnification that depends on two factors: eye axial length and optical correction with the focusing dial of the OCT. Theoretical calculations showed that the size of the optic disc image for greater axial lengths of the eye model (myopic eye) was less than that for smaller axial lengths (hyperopic eye). The disc diameter measurements of the image obtained with the OCT did not agree with the real disc size. By focussing with the focusing dial of the OCT, the power of the optics can be varied from -12.0 D to +12.0 D and the image size is decreased for all axial lengths. The maximum variation of the disc area was 2.1%. Differences in area measured at intervals of 2.0 D after correcting the eye refraction for measurements with the OCT were equivalent to the repeata...Continue Reading

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Citations

Aug 25, 2009·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Alexandre BourhisMichel Paques
Nov 23, 2011·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Nimesh B PatelRonald S Harwerth
Aug 31, 2013·Investigative Ophthalmology & Visual Science·Diana C Lozano, Michael D Twa
Feb 25, 2014·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·T RöckD Röck
Jan 15, 2013·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Patricia Flores-RodríguezEulalia Grifol-Clar
Jul 4, 2015·Indian Journal of Ophthalmology·Mohana Kuppuswamy Parthasarathy, Muna Bhende
Jan 13, 2015·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Irene CtoriByki Huntjens
Jul 19, 2014·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Hsin-Yi Chen, Yue-Cune Chang
Apr 8, 2009·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Ruozhong XieJia Qu
Feb 6, 2020·Therapeutic Advances in Ophthalmology·Funda Dikkaya, Sevil Karaman Erdur

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