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Varna Medical Forum

How auxiliary tools influence the reading speed for impaired vision patients

Binna Nencheva

Abstract

Introduction: Reading is one of the main tools which are mostly affected by impaired vision. As reading is an integral part of communication, it is often targeted as a rehabilitation goal. Low vision and blindness bear a high socio-economic price.
Aim: An analysis of the reading speed for impaired vision patients
Material and methods: The near visual acuity (Rosenbaum test from 30 cm) and the distance vision acuity (test projector) have been defined with the relevant correction. The participants read a hard copy text containing 52 words, ordered in single lines (black symbols on white background). Afterwards they read the same text with a reading glass with magnification 22. The same procedure is repeated by using a tablet by applying both a white and black background. An analysis of the different categories of patients has been made - y the impairment severity and depending on the background.
Results and discussion: A study has been conducted with the participation of 70 volunteers with permanently impaired vision with a 0,05- 0,3 correction of the better eye. The average age of the patients was 63,7 years 14,5 years, the patients above the age of 60 being prevailing. The patients with decreased transparency of the ocular media are 44,30%, followed by those with back segment diseases (24,30%) and with degenerative myopia (14,30%). The worst results were shown by the patients with pigment degeneration and optic nerve atrophy.
Conclusions: The best result was shown by the patients with visual acuity 0,1-0,3. The majority of the patients showed also quick fatigue and a tendency to stop the examination. In order to start a visual rehabilitation, it is necessary to consider the degree of visual acuity decrease, the type of the impairment, the visual reserves and the will for rehabilitation.

Keywords

скорост на четене, зрителна рехабилитация

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References

Chung ST., Mansfield J S., Legge G E. Psychophysics of reading. XVIII. The effect of print size on reading speed in normal peripheral vision Vision Res 1998; 19:2949-62

Chung S T., Levi D M., Legge G E. Spatial-frequency and contrast properties of crowding Vision Res 2001; 41:1833-50

Chung S T L The effect of letter spacing on reading speed in central and peripheral vision. Invest Ophthalmol Vis Sci 2002; 43:1270-6

Chung S T Dependence of reading speed on letter spacing in central vision loss Optom Vis Sci 2012,Sept ;89(9) :1288-1298.doi :10.1097/OPX.0b013e318264c9dd.

Leat S J, Woodhouse J M. Reading performance with low viaion aids: Relationship with contrast sesivity. Ophthalmic Phydiol Opt 1993; 13: 9-16

Legge G E Psychophysics of Reading in Normal and Low Vision Mahwah N Y & London Lawrence Erlbaum Associated 2007

Nquyen N X, Weismann M., Trauzettel-Klosinski S. Improvement of reading speed after providing of low vision aids in patients with age-related macular degeneration Acta Ophthalmol 2009; 8:849-53 doi:10.1111/j.1755-3768.2008.01423.x.


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