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Original Research
Optical lenses and magnification in archery*
African Vision and Eye Health | South African Optometrist: Vol 69, No 1 | a122 |
DOI: https://doi.org/10.4102/aveh.v69i1.122
| © 2010 B. Strydom, J. T. Ferreira
| This work is licensed under CC Attribution 4.0
Submitted: 11 December 2010 | Published: 11 December 2010
Submitted: 11 December 2010 | Published: 11 December 2010
About the author(s)
B. Strydom, Department of Optometry, University of Johannesburg, South AfricaJ. T. Ferreira, Department of Optometry, University of Johannesburg
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PDF (626KB)Abstract
The use of optical lenses to increase or magnify a target of concern is commonly used in compound bow archery. The principles and factors that may influence the use of these lenses may, however, not be fully understood by archers. Two types of lens systems, the one-lens system and the two-lens system, as described by the authors, may be used. Different factors such as the draw length of the archer,the ametropic condition of the archer, depth of field, depth of focus, age, accommodation, the power of F1 and F2 (see Figures 1 and 2 in the paper) and the distance the lens is placed from the archer may
influence the results of the lens used by the archer. (S Afr Optom 2010 69(1) 29-34)
Keywords
Optical lens; magnification; compound bow archery; one- and two-lens systems in archery.
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