Me and my research team are Optometry students. We are conducting a study on the effect of caffeine on the near triad. But we struggle to find previous research on the effect of caffeine on the vergence system especially convergence. Is there anyone that will be able to assist? Thank you!
Very interesting topic. Not much work is available that measures isolated convergence parameters alone.
1. 10.3109/02713689309001827 (small study, 16 subjects) : For the experimental group, the accommodative response/accommodative stimulus (Ar/As) slope increased 0.05 D/D after ingestion of caffeine, and the response AC/A ratio decreased 3.05 delta/D. The y-intercept of the convergence response/accommodative response increased by 3.7 delta in the experimental group. These changes were statistically significant.
2. Ajayi O.B. and George O.G. (2007). Acute effect of caffeine on Amplitude of Accommodation and Near Point of Convergence. West African Journal of Pharmacology and Drug Research. 22/23: pp. 27 – 30. Their result showed that ingested caffeine increases mean AmpofA by almost 2.00D within 30 minutes, and the elevation, though variable across patients is sustained for several minutes. The NPC and AmpofA in the decaffeinated coffee was statically insignificant (P>0.05) within the 0-90minutes of ingestion. However, there was a significant increase in the AmpofA of the experimental group (P< 0.05).
3. https://ojs.klobexjournals.com/index.php/nisebj/article/download/130/195: Most interesting results. The study revealed that the ingestion of caffeine has a significant positive effect on NPC and AmpofA. The effect is dose dependent and gender related.
4. Coon, Sarah, et al. "Caution in Clinical Interpretation of Near Point of Convergence: Influence of Time of Day on Oculomotor Function." Athletic Training & Sports Health Care, vol. 13, no. 1, Jan. 2021, pp. 7+. Gale OneFile: Health and Medicine: When designing a new study you may want to account for the impact of time of day on convergence
5.Article Caffeine alters the dynamics of ocular accommodation dependi...
It would also be good to account for the impact on regular vs non regular drinkers while designing a new study6. Article Caffeine intake is associated with pupil dilation and enhanc...
finally it is also important to measure other parameters of accomodation as well as coffee/caffeine tends to affect amplitude of accommodation and pupil size as well. In this study, Amplitude of accommodation rose from 12.4 (±2.2 D) at baseline to 15.8(±2.6 D) at 90 min. Similarly, pupil size increased from 3.4 (±0.4 mm) at baseline to 4.5 (±0.72 mm) at 90 min.- Badges
- Science topic
- Similar topics
- Filing