Cell Phone Viewing Distance and Age in a Chinese Population.
Background: A previous study from our laboratory demonstrated that the average viewing distance adopted when viewing a smartphone in American subjects was closer than the reading distance typically found when viewing printed materials. Given the very high prevalence of myopia in China (approaching 9...
| Publicado en: | Optometry & Visual Performance Vol. 6; no. 5; pp. 203 - 206 |
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| Autores principales: | , , |
| Formato: | research tables/charts Journal Article |
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Optometric Extension Program
Oct2018
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=133005032&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 133005032 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 23253479 HOOW jtl: Optometry & Visual Performance issn: 23253479 maglogo: N pubinfo: dt: Oct2018 vid: 6 iid: 5 pid: 46881 pub: Optometric Extension Program place: Lutherville Timonium, Maryland artinfo: ui: 133005032 133005032 133005032 133005032 ppf: 203 ppct: 3 formats: tig: atl: Cell Phone Viewing Distance and Age in a Chinese Population. aug: au: Min Lan Rosenfield, Mark Liu, Longqian affil: Department of Optometry & Visual Science, West China Hospital, Sichuan University, Chengdu, China sug: subj: Smartphone China Reading Behavior China Human China Adolescence Adult Middle Age Aged Descriptive Statistics Linear Regression One-Way Analysis of Variance Eyeglasses Print Materials United States Adolescent: 13-18 years Adult: 19-44 years Middle Aged: 45-64 years Aged: 65+ years ab: Background: A previous study from our laboratory demonstrated that the average viewing distance adopted when viewing a smartphone in American subjects was closer than the reading distance typically found when viewing printed materials. Given the very high prevalence of myopia in China (approaching 90% in some areas), the aim of this investigation was to measure the mean cell phone viewing distance in a Chinese population, and to examine the effect of age on this parameter. Methods: 207 Chinese subjects were instructed to view a text message on their cell phone, and to hold the device as if they were about to read the text. The distance from the phone to the spectacle plane was measured using a rigid tape measure. Results: The mean viewing distance was 33.95cm (SD = 5.90cm, range 19.0 - 51.3cm). A weak but significant positive correlation (r = 0.24, p < 0.0001) was found between age and viewing distance. No significant difference in viewing distance was observed when comparing spectacle (N=84) versus non-spectacle (N = 123) wearers (p = 0.91). Conclusions: These findings confirm the previous results that modern cell phones are held at closer viewing distances than printed materials. Further, the mean viewing distance adopted in a Chinese population was over 2cm closer than that found in American subjects. This increased demand on both ocular accommodation and vergence compared with hardcopy materials could be responsible for symptoms of digital eye strain commonly experienced in many individuals. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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