UK rates of nearsightedness have increased significantly over time,
study finds
Myopia study of more than 100,000 UK Biobank adults also found changing associations with sex, ethnicity and educational level

Date:
January 19, 2022
Source:
PLOS
Summary:
Changing environmental factors as well as changing gene-environment
interactions could be to blame for increasing rates of myopia,
also known as nearsightedness or shortsightedness, over time,
suggests a new study.



FULL STORY ========================================================================== Changing environmental factors as well as changing gene-environment interactions could be to blame for increasing rates of myopia, also known
as nearsightedness or shortsightedness, over time, suggests a new study published this week in the open-access journal PLOS ONE by Jugnoo Rahi
of University College London, and other members of the UK Biobank Eye
and Vision Consortium.


========================================================================== Previous studies have pointed toward an emerging "epidemic" of myopia, characterized by increased prevalence of myopia accompanied by both a
shift toward younger age at onset and greater severity. In the new study, researchers used data on 107,442 UK Biobank study participants aged 40
to 69 years old, born between 1939 and 1970. All participants underwent
a detailed ophthalmic exam and provided sociodemographic data as well
as information on their history of glasses and vision problems.

Overall, myopia frequency increased from 20.0% in the oldest cohort (born
1939- 1944) to 29.2% in the youngest cohort (born 1965-1970). Temporal
trends varied between types of myopia, with a greater increase in
adult-onset myopia compared to childhood-onset myopia, and a greater
increase in low myopia compared to high myopia. Moreover, the mean
spherical equivalent -- a measure of myopia severity -- worsened between cohorts, but only for childhood-onset myopia, shifting from a median of
-3.8 diopters (IQR -2.4 to -5.4) in the oldest cohort to -4.4 (IQR -3.0
to -6.2) in the youngest.

Among the trends, there were additional, notable differences in
patterns of associations with sex, ethnicity, socioeconomic status and education. In particular, the association between higher educational
attainment and myopia increased over time, from an adjusted odds ratio
of 2.7 in the oldest cohort (95% CI 2.5-2.9) to an OR of 4.2 in the
youngest cohort (95% CI 3.3-5.2) with the greatest increase seen for childhood-onset myopia (OR 3.3 (2.8-4.0) to 8.0 (4.2-13)).

The authors conclude that their evidence supports a complex of
changing environmental factors and presumably changing gene-environment interactions, discernible only by distinguishing between childhood-onset
and adult-onset myopia, which account for increasing myopia frequency.

The authors add: "Myopia is a priority of the World Health
Organization's global initiative to reduce the burden of sight
impairment. We investigated environmental risk factors driving the
'epidemic' of increasing frequency and severity of myopia in the UK
by analyzing cohort effects within the UK Biobank Study. Our findings
suggest that that the frequency of childhood-onset myopia and of high
(severe) myopia will continue to increase if increasing educational
experience or intensity in childhood is not addressed." special
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for style and length.


========================================================================== Journal Reference:
1. Phillippa M. Cumberland, Vasiliki Bountziouka, Christopher
J. Hammond,
Pirro G. Hysi, Jugnoo S. Rahi. Temporal trends in frequency, type
and severity of myopia and associations with key environmental risk
factors in the UK: Findings from the UK Biobank Study. PLOS ONE,
2022; 17 (1): e0260993 DOI: 10.1371/journal.pone.0260993 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/01/220119142804.htm

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