Refractive variation under accommodative demand: Curvital and scaled torsional variances and covariance across the meridians of the eye

Optometry and Vision Science

Volumn 74, Issue 6, 1997, Pages 445-451

  Van Gool, R D ^a   Harris, W F ^a  

^a UNIVERSITY OF JOHANNESBURG   (South Africa)

Author keywords

Accommodation; Autorefraction; Curvital variance; Scaled torsional fraction; Scaled torsional variance; Scaled torsional curvital covariance; Symmetric dioptric power space; Torsional uniformity

Indexed keywords

LIGHT REFRACTION; MATRIX ALGEBRA; OPTICAL CORRELATION; STATISTICAL OPTICS;

AUTOREFRACTION; SYMMETRIC DIOPTRIC POWER SPACE; VARIANCE COVARIANCE MATRIX;

VISION;

ACCOMMODATION; ADULT; ARTICLE; COVARIANCE; EYE REFRACTION; HUMAN; HUMAN EXPERIMENT; PRIORITY JOURNAL; REFRACTION ERROR; TORSION; VARIANCE;

ACCOMMODATION, OCULAR; ADULT; ANALYSIS OF VARIANCE; HUMANS; MATHEMATICS; OCULAR PHYSIOLOGY; OPTOMETRY; REFRACTION, OCULAR; REFRACTIVE ERRORS;

EID: 0031150186     PISSN: 10405488     EISSN: None     Source Type: Journal    
DOI: 10.1097/00006324-199706000-00030     Document Type: Article

References (14)

1. Rubin A, Harris WF. Refractive variation during autorefraction: multivariate distribution of refractive status. Optom Vis Sci 1995;72:403-10.
2. Rubin A. Short-term variation of refractive behavior in human eyes. MPhil dissertation. Department of Optometry, Rand Afrikaans University, Johannesburg, 1994.
3. Harris WF, Malan DJ, Astin CLK. Keratoreformation by contact lenses after radial keratotomy: a re-analysis. Ophthal Physiol Opt 1992;12:376-80.
4. Harris WF, Malan DJ. Analysis of the refractive status of Hong Kong Chinese infants. Ophthal Physiol Opt 1992;12:478-80.
5. Harris WF, Malan DJ, Rubin A. Variation of refractive status: its quantitative assessment. In: Brown B, Edwards M, eds. Proceedings of the 9th Asian-Pacific Optometric Congress. Hong Kong, April 8 to 12, Beijing, April 13 to 15, 1993:147-50.
6. Dunn S, Harris WF. Short-term keratometric variation in an eye. South Afr Optom 1993;52:118-21.
7. Harris WF. Representation of dioptric power in Euclidean 3-space. Ophthal Physiol Opt 1991;11:130-6.
8. Harris WF. Dioptric power: its nature and its representation in three-and four-dimensional space. Optom Vis Sci 1997;74:349-66.
9. Keating MP. Dioptric power in an off-axis meridian: the torsional component. Am J Optom Physiol Opt 1986;63:830-8.
10. Harris WF. Meridional profiles of variance-covariance of symmetric dioptric power: classes of variation that are uniform across the meridians of the eye. Optom Vis Sci 1997;74:397-413.
11. Harris WF. Meridional profiles of variance-covariance of dioptric power. Part 1: The basic theory. Ophthal Physiol Opt 1992;12:467-70.
12. Harris WF, Malan DJ. Meridional profiles of variance-covariance of dioptric power. Part 2: Profiles representing variation in one or more of sphere, cylinder and axis. Ophthal Physiol Opt 1992;12:471-7.
13. Kres H. Statistical Tables for Multivariate Analysis: A Handbook with References to Applications. New York: Springer Verlag, 1983:-Table 26, p. 426.
14. Everitt BS. Graphical Techniques for Multivariate Data. New York: North-Holland, 1978:67-73.