CPD and Education library

Study and gain CPD points through OT’s online CPD exams, and access archived CPD and CET articles, Practice team resources and Skills guides in our Education library

Find out more

Science and vision

News and features about the latest scientific developments and advances in optometry, ophthalmology and eye medicine

Find out more

Professional support

News and features about the latest developments relating to professional support from across optics. This includes updates from optical organisations such as the AOP and the GOC

Find out more

In practice

News and in-depth features about business management and career development in optics

Find out more


Explore the latest UK and global jobs in the optical sector for optometrists, dispensing opticians and more

Find out more

Children exposed to secondhand smoke experience choroidal thinning

A study of 1400 children in Hong Kong has found those with family members who smoke at home have thinner choroids

Household exposure to secondhand smoke has been linked to choroidal thinning in a Hong Kong study involving 1400 children.

The research, which was published in JAMA Ophthalmology, involved detailed ophthalmic examinations of children aged between six and eight.

The parents or legal guardians of the children were then asked about their smoking status.

Parents were asked if they or another member of the family smoked at home. They were also asked how long they smoked for and how many cigarettes they had each day.

Of the 1400 children, 941 had no exposure to secondhand smoking and 459 had some exposure to secondhand smoking.

Analysis of the results revealed that smoking exposure was linked to a thinner choroid by 8.3 micrometres (μm) in the central subfield, 7.2μm in the inner inferior, 6.4μm in the outer inferior, 6.4μm in the inner temporal, and 7.3μm in the outer temporal.

An increased number of family members who smoked and greater tally of daily cigarettes were both associated with a higher level of choroidal thinning in the study participants.

“These results support evidence regarding the potential hazards of secondhand smoking to children,” the authors emphasised.

Image credit: Pixabay/ArtTower