By Robert P. Cubbidge
Eye necessities is a brand new sequence of texts which gives authoritative and available details for all eye care execs, even if in education or in perform. each one pocket advisor is either a swift overview device for college students and a convenient scientific reference advisor for practitioners. With beneficial properties akin to tables, key bullet issues, medical pearls, perform pitfalls, summaries, motion icons and gorgeous complete colour illustrations, this sequence has swiftly proven itself as a very good resource of crucial info for modern day readers.
- Practical suggestions that's proof based
- Full-color illustrations make clear key information
- Highlighted suggestion sections for sufferers and convenient tables throughout
- Authoritative counsel on visible fields from a revered chief within the field
- Provides crucial details in a single handy evaluation source
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Extra resources for Visual Fields
Some perimeters, namely the Octopus 300 series and Oculus perimeters, incorporate an objective lens in their design, so that the light stimuli are projected to infinity. In these perimeters, the distance correction is required for patients. Varifocal lenses induce spherical defocus from a distance and intermediate portions and significant cylindrical defocus in the inferior peripheral portions of the lens. Consequently, only single vision lenses are suitable for perimetry. Full aperture lenses must be used, in order that peripheral ring scotomas are not induced by the lens rim.
A wide variety of visual field indices have been developed for the Octopus and Humphrey Field Analyser perimeters to summarize the data reduction at each stimulus location. 7 Isolated loss Loss variance and pattern standard deviation Mean sensitivity Mean sensitivity (MS) simply represents the arithmetic mean of the measured sensitivity at all stimulus locations tested in the visual field. Since there is no reference to the patient’s age this index is of little use clinically. This statistic is employed in the Octopus and Henson perimeters.
J Glaucoma 8: 290–296. A. (1987). Effect of defocus on visual field measurement. Ophthal. Physiol. Opt. 7: 259–265. Heijl, A. and Bengtsson, B. The effect of perimetric experience in patients with glaucoma. Arch. Ophthalmol. 114: 19–22. Heijl, A. T. (1975). An automatic static perimeter, design and pilot study. Acta Ophthalmol. M. C. (1993). Fatigue effects during a single session of automated static threshold perimetry. Invest. Vis. Sci. 35: 268–280. Katz, J. and Sommer, A. (1988). Reliability indexes of automated perimetric tests.