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Fulltext Visual acuity measured with luminance-modulated and contrast-modulated noise letter stimuli in young adults and adults above 50 years old

Woi PJ, Kaur S, Waugh SJ, Hairol MI

F1000Res, 2016;5:1961.
PMID: 28184281 DOI: 10.12688/f1000research.9410.1

The human visual system is sensitive in detecting objects that have different luminance level from their background, known as first-order or luminance-modulated (LM) stimuli. We are also able to detect objects that have the same mean luminance as their background, only differing in contrast (or other attributes). Such objects are known as second-order or contrast-modulated (CM), stimuli. CM stimuli are thought to be processed in higher visual areas compared to LM stimuli, and may be more susceptible to ageing. We compared visual acuities (VA) of five healthy older adults (54.0±1.83 years old) and five healthy younger adults (25.4±1.29 years old) with LM and CM letters under monocular and binocular viewing. For monocular viewing, age had no effect on VA [F(1, 8)= 2.50, p> 0.05]. However, there was a significant main effect of age on VA under binocular viewing [F(1, 8)= 5.67, p< 0.05]. Binocular VA with CM letters in younger adults was approximately two lines better than that in older adults. For LM, binocular summation ratios were similar for older (1.16±0.21) and younger (1.15±0.06) adults. For CM, younger adults had higher binocular summation ratio (1.39±0.08) compared to older adults (1.12±0.09). Binocular viewing improved VA with LM letters for both groups similarly. However, in older adults, binocular viewing did not improve VA with CM letters as much as in younger adults. This could reflect a decline of higher visual areas due to ageing process, most likely higher than V1, which may be missed if measured with luminance-based stimuli alone.
Fulltext Comparison of vergence mechanisms between university students with good and poor sleep quality

Woi PJ, Lu JYL, Hairol MI, Ibrahim WNA

Int J Ophthalmol, 2024;17(2):353-358.
PMID: 38371264 DOI: 10.18240/ijo.2024.02.19

AIM: To compare the vergence mechanisms between good and poor sleepers in university students.
METHODS: A total of 64 university students were recruited in this study. The validated Malay version of Pittsburgh Sleep Quality Index questionnaire (PSQI-M) was used to measure the participants' sleep quality over the past month. Participants were categorized as good sleepers (n=32) and poor sleepers (n=32) based on the PSQI-M scores. Heterophoria and fusional vergences were measured at distance and near. Mann-Whitney U test was used to compare heterophoria, negative fusional vergence (NFV), and positive fusional vergence (PFV) at distance and near between good and poor sleepers. Spearman correlation analysis was used to study the relationship between PSQI-M score and PFV at distance.
RESULTS: Both distance and near heterophorias were not significantly different between good and poor sleepers (P>0.05). There was a difference in distance PFV (P<0.05) between good and poor sleepers, but not in distance NFV, near NFV, and near PFV (P>0.05). Distance PFV was negatively correlated with PSQI-M score (rs=-0.33, P<0.05).
CONCLUSION: University students with poor sleep quality demonstrates a reduced ability to maintain fusion with increasing convergence demand at distance. Sleep quality assessment during binocular vision examination in university students is recommended.
Fear of detachment from mobile phone: nomophobia and suicidality among Malaysian university students before and during the COVID-19 pandemic

Pang KY, Siau CS, Ho MC, Ooi PB, Tan YK, Woi PJ, et al.

Psychol Health Med, 2023 Oct 24.
PMID: 37876137 DOI: 10.1080/13548506.2023.2274315

The attachment to mobile devices during the COVID-19 pandemic has led to the possibility of increased nomophobia, which is the intense fear of losing access to one's mobile device. Therefore, this study aimed to determine if nomophobia was independently associated with suicidality before and during the COVID-19 pandemic among university students in Malaysia. This cross-sectional study had two-time points in data collection: one year before and one year into the COVID-19 pandemic. N = 806 university students aged ≥ 18 years completed an online questionnaire comprising the Nomophobia Questionnaire, Multidimensional Scale of Perceived Social Support, and the Suicidal Behaviors Questionnaire-Revised. A multiple logistic regression (controlling for gender, age, and social support) was conducted to determine the association between nomophobia and suicidality before and during the COVID-19 pandemic. The prevalence of severe nomophobia before and during the COVID-19 pandemic was 15.7% and 35.6% respectively. The level of nomophobia was significantly higher during the COVID-19 pandemic compared to pre-pandemic. Pre-pandemic, there were no significant associations. During the pandemic, participants with moderate (aOR 3.09, 95% CI [1.14-8.40], p = .027) and severe (aOR 3.57, 95% CI [1.25-10.20], p = .018) nomophobia had higher odds of suicide plan. During the pandemic, moderate and severe nomophobia were independently associated with more than three times higher odds for a lifetime suicide plan. Our study findings carry implications for the well-being of university students.

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