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Resemblance between tonometer readings on relatives and spouses

Acta Ophthalmologica

|February 1, 1976

Summary

Environmental factors significantly influence tonometer readings, showing resemblance between spouses and relatives. This suggests shared environments play a key role in intraocular pressure variations.

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Area of Science:

Ophthalmology
Genetics
Environmental Health

Background:

Intraocular pressure (IOP) measurement using a tonometer is crucial for glaucoma detection.
Previous studies suggest genetic and environmental factors influence IOP, but the extent of environmental contribution requires further investigation.

Purpose of the Study:

To investigate the resemblance of tonometer readings within families and between spouses.
To differentiate the contributions of genetic and environmental factors to IOP variations.

Main Methods:

Analysis of tonometer readings from 1042 individuals in 365 nuclear families and 1333 spouse pairs from a population survey.
Exclusion of individuals with suspected glaucoma to focus on general population resemblance.
Comparison of resemblance across different sex compositions and relationship types.

Main Results:

A significant resemblance in tonometer readings was observed between spouses, comparable to that between genetic relatives.
Differences in resemblance based on sex composition align with expected environmental influences.
Resemblance showed a tendency to increase with age, suggesting cumulative environmental effects.

Conclusions:

Common environmental factors significantly contribute to the resemblance of tonometer readings among relatives.
The findings highlight the substantial role of shared environments in shaping intraocular pressure.
Environmental influences on IOP may accumulate over time, impacting resemblance with age.

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