Below is a selection of publications from our lab. Where publishers fail to provide digital object identifiers and good quality searchable PDFs, links are to local copies. Listing is reverse-chronological within topical groups (see links in Left Menu).
| Extraocular Muscle Forces (EOMF) |
Bupivacaine injection of eye muscles to treat strabismus. Br J Ophthalmol, vol 91, isu 2, pgs 146-148.
No Oculomotor Plant, No Final Common Path. Strabismus, vol 11, isu 4, pgs 205-211.
Missing Lateral Rectus Force and Absence of Medial Rectus Co-Contraction in Ocular Convergence. Journal of Neurophysiology, vol 87, pgs 2421-2433.
Contrary to expectations based on abducens single unit studies, direct physiologic measurements of lateral and medial rectus muscle forces in 3 monkeys shows no increase associated with eye convergence. This implies that a fundamental assumption of oculomotor physiology that a single homogeneous "final common path" serves all supernuclear subsystems is wrong.
New models of the oculormotor mechanics based on data obtained with chronic muscle force transducers. Annals of Biomedical Engineering.
Extraocular muscle forces in alert monkey. Vision Res, vol 32, isu 6, pgs 1099-1113.
First measurements of static and dynamic physiologic EOM forces in an alert behaving animal, utilizing a chronically-implantable transducer designed and built in our laboratory.
Muscle dynamics during monkey saccadic eye movements and simulated saccadic eye movements. IEEE Engineering in Medicine and Biology, vol 13.
Chronic recording of EOM forces in alert monkey. In Association for Research in Vision and Ophthalmology (ARVO), 31 (pgs 289). Sarasota, FL: Investigative Opthalmology and Visual Science.
| Extraocular Biomechanics (EOB) |
False Differential Predictions in Lee, Lai, Brodale & Jampolsky (2007). eLetter submitted to IOVS in response to "Kyoung-Min Lee, Annie P. Lai, James Brodale, & Arthur Jampolsky (2007). Sideslip of the Medial Rectus Muscle during Vertical Eye Rotation. IOVS, 48 (10), 4527-4533".
Jampolsky’s group has opposed the notion of EOM pulleys (see also McClung, Allman, Dimitrova & Goldberg, 2006) that has evolved over the past 20 years based on broad evidence of many types (see review in Miller 2007a, below), including recently, the compelling findings of Ghasia & Angelaki (2005) and Klier & Angelaki (2006), which Lee et al misrepresent and dismiss. Here, they use unproven, artifact-vulnerable, poorly specified methodology, where suitable broadly accepted methodology exists, and report only selected data. In interpreting their results, Lee et al selectively apply their arguments to an obsolete non-pulley model and a straw-man pulley model, the later having trochlea-like, localized, rigid pulleys, never previously proposed. Even with these biases, Lee et al cannot explain their data without assuming the existence of distributed, elastic, musculo-orbital, origin-determining EOM pulleys.
Understanding and Misunderstanding Extraocular Muscle Pulleys. Journal of Vision, vol 7, num 11, art 10, pgs 1-15, http://journalofvision.org/7/11/10, doi:10.1167/7.11.10.
As evidence has mounted for the critical role of extraocular muscle (EOM) pulleys in normal ocular motility and disease, opposition to the notion has grown more strident. We review the stages through which pulley theory has developed, distinguishing passive, coordinated, weak differential, and strong differential pulley theories and focusing on points of controversy. There is overwhelming evidence that much of the eye's kinematics, once thought to require brainstem coordination of EOM innervations, is determined by orbital biomechanics. The main criticisms of pulley theory only apply to the strong differential theory, abandoned in 2002. Critiques of the notion of dual EOM insertions are shown to be mistaken. The role of smooth muscle and the issue of rotational noncommutativity are clarified. We discuss how pulley sleeves can be stabilized as required by the theory, noting that more work needs to be done in specifying the tissues involved.
Clinical Applications Of Computer Models For Strabismus. In eds Rosenbaum, A and Santiago, AP, Clinical Strabismus Management. cty Philadelphia, pub W. B. Saunders.
Heterotopic muscle pulleys or oblique muscle dysfunction? Journal of the American Association for Pediatric Ophthalmology and Strabismus, vol 2, isu 1, pgs 17-25.
Innervation of Extraocular Pulley Smooth Muscle in Monkeys and Humans. Investigative Ophthalmology & Visual Science, vol 38, isu 9, pgs 1774-1785.
New Orbital Constraints on Eye Rotation. In eds Fetter, M, Misslisch, H and Tweed, D, Three-dimensional kinematic principles of eye, head and limb movement. cty Chur, Switzerland, pub Harwood.
Uses of Biomechanical Modeling. In Proceedings of CLADE, Buenos Aires, 1996.
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Orbit 1.8 gaze mechanics simulation. Eidactics; Suite 404; Greenwich Street; San Francisco, CA 94109; USA.
Effect of transposition surgery on rectus muscle paths by magnetic resonance imaging. Ophthalmology, vol 100, isu 4, pgs 475-487.
This paper reports the first test of the pulley model, in which the experiment outlined by Miller (1989) was performed in 4 human strabismus patients. Images of muscle paths, before and after vertical recti were reinserted at the margins of the lateral rectus, showed that the vertical rectus muscle bellies remained close to their pre-operative positions, supporting the pulley model, and leading to subsequent studies of pulley tissue anatomy, histology, and innervation.
Upshoots and Downshoots in Duane's Syndrome: Analysis by MRI and Biomechanical Modeling. Investigative Ophthalmology & Visual Science, vol 33, isu 4, pgs 1150.
Clinical correlations of models of orbital statics. In Scott, AB (Ed.), Mechanics of Strabismus Symposium, (pgs 141-161). San Francisco: Smith-Kettlewell Eye Research Institute.
Biomechanical analysis of strabismus. Binocular Vision and Eye Muscle Surgery Quarterly, vol 7, isu 4, pgs 233-248.
Eye muscle prosthesis. J Pediatr Ophthalmol Strabismus, vol 29, isu 4, pgs 216-8.
Two mechanisms of up-shoots and down-shoots in Duane's syndrome revealed by a new magnetic resonance imaging (MRI) technique. In eds Campos, EC, Strabismus and Ocular Motility Disorders , pgs 229-234. cty London, pub Macmillian Press.
Functional anatomy of normal human rectus muscles. Vision Res, vol 29, isu 2, pgs 223-40.
The modern concept of EOM pulleys is first proposed: extraocular muscle sheaths function as pulleys fixed to the orbital wall, significantly affect muscle actions, and require quite different eye movement control signals than muscles without pulleys. The type of no-pulley model that would give rise to "bridle forces" is shown to be wrong. A test of the pulley model is described using MRI data before and after muscle transposition surgery, and early results from such studies are cited to support the pulley model (see Miller et al 1993 for more).
The roles of expert systems and biomechanical models in eye muscle surgery. IEEE Engineering in Medicine and Biology, vol 4, isu 4, pgs 17-25.
Applications of the SQUINT computer strabismus model. In Association for Research in Vision and Ophthalmology, 26 (pgs 253). Sarasota, FL: Investigative Opthalmology and Visual Science.
Computer model of binocular alignment. In Semmlow, JL and Welkowitz, W (Ed.), Sixth Annual Conference, IEEE Engineering in Medicine and Biology Society, . New York, NY.
A model of the mechanics of binocular alignment. Comput Biomed Res, vol 17, isu 5, pgs 436-70.
Mechanical model applications. In Gregersen, E (Ed.), Transe European Strabismological Association, 14th Meeting, (pgs 1-8). Copenhagen, Denmark: Jencodan Tryk Aps.
| Extraocular Tissue Architecture (EOTA) |
Stability of gold bead tissue markers. Journal of Vision, 6(5), 616-624, http://journalofvision.org/6/5/6/, doi:10.1167/6.5.6.
A new soft tissue imaging method that uses tiny (~0.1 mm dia) gold beads as markers to visualize tissue movements with high spatial (~100 µm) and moderate temporal (~100 ms) resolution.
Extraocular Tissue Architectire. Journal of vision, Volume 3, Number 3, Article 5, pgs 240-251.
Three-dimensional Location of Human Rectus Pulleys by Path Inflection in Secondary Gaze Positions. Investigative Ophthalmology & Visual Science, vol 41, isu 12, pgs 3787-3797.
Innervation of Extraocular Pulley Smooth Muscle in Monkeys and Humans. Investigative Ophthalmology & Visual Science, vol 38, isu 9, pgs 1774-1785.
Magnetic resonance imaging of the functional anatomy of the superior oblique muscle. Invest Ophthalmol Vis Sci, vol 36, isu 5, pgs 906-13.
Evidence for fibromuscular pulleys of the recti extraocular muscles. Investigative Ophthalmology and Visual Science, vol 36, pgs 1125-1136.
Quantitative magnetic resonance morphometry of extraocular muscles: a new diagnostic tool in paralytic strabismus. J Pediatr Ophthalmol Strabismus, vol 31, isu 3, pgs 177-88.
Effect of transposition surgery on rectus muscle paths by magnetic resonance imaging. Ophthalmology, vol 100, isu 4, pgs 475-487.
This paper reports the first test of the pulley model, in which the experiment outlined by Miller (1989) was performed in 4 human strabismus patients. Images of muscle paths, before and after vertical recti were reinserted at the margins of the lateral rectus, showed that the vertical rectus muscle bellies remained close to their pre-operative positions, supporting the pulley model, and leading to subsequent studies of pulley tissue anatomy, histology, and innervation.
Functional anatomy of normal human rectus muscles. Vision Res, vol 29, isu 2, pgs 223-40.
The modern concept of EOM pulleys is first proposed: extraocular muscle sheaths function as pulleys fixed to the orbital wall, significantly affect muscle actions, and require quite different eye movement control signals than muscles without pulleys. The type of no-pulley model that would give rise to "bridle forces" is shown to be wrong. A test of the pulley model is described using MRI data before and after muscle transposition surgery, and early results from such studies are cited to support the pulley model (see Miller et al 1993 for more).
Images of normal and abnormal human rectus muscles as a function of gaze. In Association for Research in Vision and Ophthalmology, 29 (pgs 343). Sarasota, FL: Investigative Opthalmology and Visual Science.
Extraocular muscle sideslip and orbital geometry in monkeys. Vision Res, vol 27, isu 3, pgs 381-92.
Side-slip and the action of extraocular muscles. In Association for Research in Vision and Ophthalmology, (pgs 182). Sarasota, FL: Investigative Opthalmology and Visual Science.
| Direction Perception & Sensorimotor Adaptation (DPSA) |
Different motor systems use similar damped extraretinal eye position information. Vision Research, vol 39, pgs 1025-1038.
Where Are The Things We See? Nature, vol 386 (10 April), pgs 550-551.
Egocentric localization of a perisaccadic flash by manual pointing. Vision Research, vol 36, num 6, pgs 837-851.
Saccadic plasticity: parametric adaptive control by retinal feedback. Journal of Experimental Psychology: Human Perception and Performance, vol 7, pgs 356-366.
Information used by the perceptual and oculomotor systems regarding the magnitude of saccadic and pursuit eye movements. Vision Research, vol 20, pgs 59-68.
Visual-motor conflict resolved by motor adaptation without perceptual change. The Behavioral and Brain Sciences, vol 2, pgs 76.
Impact of oculomotor retraining on the visual perception of curvature. Journal of Experimental Psychology: Human Perception and Performance, 3(2), 187-200.