Ocular dominance, sometimes called eye preference or eyedness, is the tendency to prefer visual input from one eye to the other. It is somewhat analogous to the laterality of right- or left-handedness; however, the side of the dominant eye and the dominant hand do not always match. This is because both hemispheres control both eyes, but each one takes charge of a different half of the field of vision, and therefore a different half of both retinas (See Optic Tract for more details). There is thus no direct analogy between "handedness" and "eyedness" as lateral phenomena.
Approximately two-thirds of the population is right-eye dominant and one-third left-eye dominant. however in a small portion of the population neither eye is dominant. Dominance does appear to change depending upon direction of gaze due to image size changes on the retinas. There also appears to be a higher prevalence of left-eye dominance in those with Williams–Beuren syndrome, and possibly in migraine sufferers as well. Eye dominance has been categorized as "weak" or "strong"; highly profound cases are sometimes caused by amblyopia or strabismus.
In those with anisometropic myopia (i.e. different amounts of nearsightedness between the two eyes), the dominant eye has typically been found to be the one with more myopia. As far as regards subjects with normal binocular vision, the widespread notion that the individual's better-sighted eye would tend to be the dominant eye has been challenged as lacking empirical basis.
In normal binocular vision there is an effect of parallax, and therefore the dominant eye is the one that is primarily relied on for precise positional information. This may be extremely important in sports which require aim, such as archery, darts or shooting sports.
It has been asserted that cross-dominance (in which the dominant eye is on one side and the dominant hand is on the other) is advantageous in sports requiring side-on stances (e.g. baseball, cricket, golf); however, studies within the last 20 years have shown this not to be the case. In a 1998 study of professional baseball players, hand–ocular dominance patterns did not show an effect on batting average or ERA. Similarly, in 2005, a South African study found that "cricketers were not more likely to have crossed dominance" than the normal population.
The dominant eye has more neural connections to the brain than the other eye does. According to a sixty-person study in the Proceedings of the Royal Society B, in non-dyslexic people, the blue cone-free spot in the dominant eye tends to be round and the same spot in the non-dominant eye tends to be unevenly shaped; in dyslexic people both eyes tend to have round areas. The study suggests this difference may be a potential, and possibly treatable, cause of dyslexia; however, further tests are required to confirm. At least 700 million people worldwide have dyslexia. In response to the study, John Stein of the University of Oxford cautions that while the study is "really interesting", there is no one single cause of dyslexia.
- The Miles test. The observer extends both arms, brings both hands together to create a small opening, then with both eyes open views a distant object through the opening. The observer then alternates closing the eyes or slowly draws opening back to the head to determine which eye is viewing the object (i.e. the dominant eye).
- The Porta test. The observer extends one arm, then with both eyes open aligns the thumb or index finger with a distant object. The observer then alternates closing the eyes or slowly draws the thumb/finger back to the head to determine which eye is viewing the object (i.e. the dominant eye).
- The Dolman method, also known as the hole-in-the-card test. The subject is given a card with a small hole in the middle, instructed to hold it with both hands, then instructed to view a distant object through the hole with both eyes open. The observer then alternates closing the eyes or slowly draws the opening back to the head to determine which eye is viewing the object (i.e. the dominant eye).
- The convergence near-point test. The subject fixates an object that is moved toward the nose until divergence of one eye occurs (i.e. the non-dominant eye). It is an objective test of ocular dominance.
- Certain stereograms.
- The pinhole test.
- The ring test.
- Lens fogging technique. The subject fixates a distant object with both eyes open and appropriate correction in place. A +2.00 or +2.50 lens is alternately introduced in front of each eye, which blurs the distant object. The subject is then asked to state in which eye is the blur more noticeable. This is the dominant eye.
- A dichoptic motion coherence threshold test yields a quantified indication of ocular dominance.
Forced choice tests of dominance, such as the Dolman method, allow only a right or left eye result.
- Chaurasia BD, Mathur BB (1976). "Eyedness". Acta Anat (Basel). 96 (2): 301–5. doi:10.1159/000144681. PMID 970109.
- Khan AZ, Crawford JD (2001). "Ocular dominance reverses as a function of horizontal gaze angle". Vision Res. 41 (14): 1743–8. doi:10.1016/S0042-6989(01)00079-7. PMID 11369037.
- Porac C, Coren S (1975). "Is eye dominance a part of generalized laterality?". Percept Mot Skills. 40 (3): 763–9. doi:10.2466/pms.19220.127.116.113. PMID 1178363.
- Reiss MR; Reiss, Gilfe (1997). "Ocular dominance: some family data". Laterality. 2 (1): 7–16. doi:10.1080/713754254. PMID 15513049.
- Ehrenstein WH, Arnold-Schulz-Gahmen BE, Jaschinski W (2005). "Eye preference within the context of binocular functions". Graefes Arch. Clin. Exp. Ophthalmol. 243 (9): 926–32. doi:10.1007/s00417-005-1128-7. PMID 15838666.
- Eser I, Durrie DS, Schwendeman F, Stahl JE (September 2008). "Association between ocular dominance and refraction". Journal of Refractive Surgery. 24 (7): 685–9. PMID 18811110.
- Aswathappa, Jagadamba, Karthiyanee Kutty, and Nachal Annamalai. "Relationship between handedness and ocular dominance in healthy young adults–A study." Int J Pharm Biomed Res 2.2 (2011): 76-78.
- Quartley J, Firth AY (2004). "Binocular sighting ocular dominance changes with different angles of horizontal gaze". Binocul Vis Strabismus Q. 19 (1): 25–30. PMID 14998366.
- Banks MS, Ghose T, Hillis JM (2004). "Relative image size, not eye position, determines eye dominance switches". Vision Res. 44 (3): 229–34. doi:10.1016/j.visres.2003.09.029. PMID 14642894.
- Van Strien JW, Lagers-Van Haselen GC, Van Hagen JM, De Coo IF, Frens MA, Van Der Geest JN (2005). "Increased prevalences of left-handedness and left-eye sighting dominance in individuals with Williams-Beuren syndrome". J Clin Exp Neuropsychol. 27 (8): 967–76. doi:10.1080/13803390490919119. PMID 16207621.
- Aygül R, Dane S, Ulvi H (2005). "Handedness, eyedness, and crossed hand-eye dominance in male and female patients with migraine with and without aura: a pilot study". Percept Mot Skills. 100 (3 Pt 2): 1137–42. doi:10.2466/pms.100.3c.1137-1142. PMID 16158700.
- Handa T, Shimizu K, Mukuno K, Kawamorita T, Uozato H (2005). "Effects of ocular dominance on binocular summation after monocular reading adds". J Cataract Refract Surg. 31 (8): 1588–92. doi:10.1016/j.jcrs.2005.01.015. PMID 16129296.
- Cheng CY, Yen MY, Lin HY, Hsia WW, Hsu WM (2004). "Association of ocular dominance and anisometropic myopia". Invest. Ophthalmol. Vis. Sci. 45 (8): 2856–60. doi:10.1167/iovs.03-0878. PMID 15277513.
- Vincent SJ, Collins MJ, Read SA, Carney LG, Yap MK (2011). "Interocular symmetry in myopic anisometropia". Optom Vis Sci. 88 (12): 1454–62. doi:10.1097/OPX.0b013e318233ee5f. PMID 21964662.
- Pointer JS (January 2007). "The absence of lateral congruency between sighting dominance and the eye with better visual acuity". Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists). 27 (1): 106–10. doi:10.1111/j.1475-1313.2006.00414.x. PMID 17239197.
- Brian Ariel. "Sports Vision Training: An expert guide to improving performance by training the eyes."
- Laby DM, Kirschen DG, Rosenbaum AL, Mellman MF (1998). "The effect of ocular dominance on the performance of professional baseball players". Ophthalmology. 105 (5): 864–6. doi:10.1016/S0161-6420(98)95027-8. PMID 9593388.
- Thomas NG, Harden LM, Rogers GG (2005). "Visual evoked potentials, reaction times and eye dominance in cricketers". J Sports Med Phys Fitness. 45 (3): 428–33. PMID 16230997.
- Handa T, Mukuno K, Uozato H, et al. (2004). "Ocular dominance and patient satisfaction after monovision induced by intraocular lens implantation". J Cataract Refract Surg. 30 (4): 769–74. doi:10.1016/j.jcrs.2003.07.013. PMID 15093637.
- France-Presse, Agence (18 October 2017). "Dyslexia: scientists claim cause of condition may lie in the eyes". The Guardian. Retrieved 21 October 2017.
- "Dyslexia eye link spotted by scientists". BBC News. 18 October 2017. Retrieved 21 October 2017.
- Kromeier M, Heinrich SP, Bach M, Kommerell G (2006). "Ocular prevalence and stereoacuity". Ophthalmic Physiol Opt. 26 (1): 50–6. doi:10.1111/j.1475-1313.2005.00344.x. PMID 16390482.
- "Shooting Eye Dominance for Bows & Guns". www.huntersfriend.com. Retrieved 2016-04-22.
- Roth HL, Lora AN, Heilman KM (2002). "Effects of monocular viewing and eye dominance on spatial attention". Brain. 125 (Pt 9): 2023–35. doi:10.1093/brain/awf210. PMID 12183348.
- "Determining your Dominant Eye". Pat Norris Archery. Archived from the original on 19 February 2015.
- "Right or left eye dominant? . . . . . how to check". Archived from the original on 10 December 2001.
- "Eye Dominance Test". SportVue. Archived from the original on 15 February 2008.
- "Stereogram test for right/left eye dominance". Archived from the original on 22 May 2008.
- Berens C, Zerbe J (1953). "A new pinhole test and eye-dominance tester". Am. J. Ophthalmol. 36 (7): 980–1. doi:10.1016/0002-9394(53)92183-7. PMID 13065383.
- Safra D (1989). "[The "Ring Test" for evaluating eye dominance]". Klin Monatsbl Augenheilkd (in German). 195 (1): 35–6. doi:10.1055/s-2008-1046410. PMID 2796230.
- Li J, Lam CS, Yu M, Hess RF, Chan LY, Maehara G, Woo GC, Thompson B (December 2010). "Quantifying sensory eye dominance in the normal visual system: a new technique and insights into variation across traditional tests". Investigative Ophthalmology & Visual Science. 51 (12): 6875–81. doi:10.1167/iovs.10-5549. PMID 20610837.
|In cognitive abilities||Geschwind–Galaburda hypothesis|
|In eyes||Ocular dominance|
|Handedness in boxing||Southpaw stance||Orthodox stance|
|Handedness in people||Musicians|
|Handedness related to|
|Handedness measurement||Edinburgh Handedness Inventory|
|In major viscera||Situs solitus||Situs ambiguus||Situs inversus|
|Footedness in surfing||Regular foot||Goofy foot|