The Occupants’ Visual Acuity and Performance: Methods for Measuring Occupants’ Visual and Writing Performances in Daylight Spaces
Acceptable illuminance level in spaces is essential for optimum task performance that requires visual efficiency such as reading and writing. Passive design strategies are developed to meet the occupants’ visual comfort such as optimizing the daylight source. Guidelines and standards around the world highlighted that the acceptable illuminance level in offices and schools are between 300 lx to 500 lx. Various methods have been developed to identify the reading and writing performance of occupants relating to daylight and illuminance level. This paper aims to study suitable methods that can be developed in identifying the occupants’ reading and writing performance in daylight spaces. The most common method to measure the respondents’ writing performance is the speed (minute) and word per minute (wpm) of the respondents to complete the writing task such as Handwriting Speed Test (HST) and Detailed Assessment Speed Handwriting (DASH). Similarly, for reading performance, the respondents are required to read visual eyes acuity test charts such as Landolt C and Snellen eye charts. Literature reviews suggested that the illuminance level of the space correlates with the occupants’ performance, where illuminance level higher and lower than recommended by guidelines decreases their overall performance. Therefore, we propose a suitable method to identify the respondents’ writing task performance by using the existing handwriting assessment, which obtains the respondents’ word per minute (wpm) against the illuminance level of the space. This will benefit the lighting system and sensor in learning spaces in the dynamic daylighting calculations.
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