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An Assessment of the Benefit of Internal Illumination in Keypads

by Antoinette Fennell

Full Contents

List of Tables

List of Figures

Full Contents

Introduction and Methods

The Experimental Keypads

The Experimental Keypad Labels

Internal Illumination Level

Ambient Lighting Level

Experimental Procedure

Test Subjects

Statistical Analysis

Hypotheses

Results

Hypothesis 1: Is there a difference in data input success for partially sighted test subjects versus test subjects with good vision?

Hypothesis 2: Does internal illumination on a keypad improve data input success?

Hypothesis 3: Does ambient lighting affect data input?

Hypothesis 4: Does internal illumination level have an effect on data input success?

Hypothesis 5: Is there a difference in data input success on an internally illuminated keypad compared to a non-illuminated keypad, under different ambient lighting conditions?

Discussion

Hypothesis 1: Is there a difference in data input success for partially sighted test subjects versus test subjects with good vision?

Hypothesis 2: Does internal illumination on a keypad improve data input success?

Hypothesis 3: Does ambient lighting affect data input?

Hypothesis 4: Does internal illumination level have an effect on data input success?

Hypothesis 5: Is there a difference in data input success on an internally illuminated keypad compared to a non-illuminated keypad, under different ambient lighting conditions?

Test Subject Feedback

Final Conclusions and Recommendations

List of Tables

Table 1. Results of the pairwise comparison of data input success for partially sighted test subjects versus test subjects with good vision, for the six testing conditions, using data input success averages for each test subject.

Table 2. Descriptive Statistics of the Input Data for the six different test conditions for n = 9 test subjects.

Table 3. Pairwise analysis of the six test conditions for n = 9 test subjects (Wilcoxon Signed Ranks Test).

List of Figures

Figure 1. Photograph of the non-illuminated keypad with randomised letter labels on the "numeric" keys.

Figure 2a. Photograph of the internally-illuminated keypad under dark ambient lighting with randomised letter labels on the "numeric" keys.

Figure 2b. Photograph of the internally-illuminated keypad under dim ambient lighting with randomised letter labels on the "numeric" keys.

Figure 2c. Photograph of the internally-illuminated keypad under bright ambient lighting with randomised letter labels on the "numeric" keys.