A study by Scott Read of the QUT School of Optometry found the upper eyelid's pressure and shape of its opening work to change the shape of our eyes throughout the day.
Dr Read found the biggest changes were amongst people who maintained a downward gaze for a long time while reading or doing close work.
"The first study found that there were highly significant changes to the contours of the cornea (the eye's front surface) throughout the day when we tested at 9am, 1pm and 5pm over three days of the week," Dr Read said.
"The study found horizontal bands of distortion appeared on the cornea where the eyelid would have been sitting and that this increased during the day but went back to normal by the next morning.
"As these changes appear to be related to forces from the eyelids themselves and were more marked in people who spent a lot of time reading in downward gaze it is certainly one reason why people's vision may be slightly worse at the end of the day or after doing a lot of close work.
"It suggests that people should take a short break from reading or close work at least every hour."
Dr Read said some changes were also found in corneal astigmatism (which can lead to distortion of vision due to irregularities of the cornea), a condition that affects up to 60% of people.
In a second study on 100 normal-sighted young subjects, Dr Read described the shape of the eyelid opening at different angles of gaze and compared this with the contours of the cornea to find out how eyelid characteristics and corneal shape affected each other.
He found significant associations between the angle, shape and size of the eyelids and the shape of the cornea.
"It appears eyelids do play a part in determining the shape of the cornea. One explanation is that pressure from the eyelids is involved in the cause of corneal astigmatism.
"As yet we have no concrete evidence on what causes astigmatism but this helps us move towards finding a cause."
His findings would provide the groundwork for new understanding about astigmatism in children and in older age.
"Children are born with a high degree of astigmatism and the cornea changes shape rapidly in the first four years of life, so the study's findings could shed light on how some people go on to develop astigmatism," he said.
"Astigmatism also changes in older age, so this may help to explain some of these changes that happen to our vision in older age."
Dr Read's research would also open our eyes to new areas of research on accurately measuring pressure from the eyelids, and how these corneal changes may affect the development of short sightedness.
Niki Widdowson | EurekAlert!
Rutgers-led innovation could spur faster, cheaper, nano-based manufacturing
14.02.2018 | Rutgers University
New study from the University of Halle: How climate change alters plant growth
12.01.2018 | Martin-Luther-Universität Halle-Wittenberg
A newly developed laser technology has enabled physicists in the Laboratory for Attosecond Physics (jointly run by LMU Munich and the Max Planck Institute of Quantum Optics) to generate attosecond bursts of high-energy photons of unprecedented intensity. This has made it possible to observe the interaction of multiple photons in a single such pulse with electrons in the inner orbital shell of an atom.
In order to observe the ultrafast electron motion in the inner shells of atoms with short light pulses, the pulses must not only be ultrashort, but very...
A group of researchers led by Andrea Cavalleri at the Max Planck Institute for Structure and Dynamics of Matter (MPSD) in Hamburg has demonstrated a new method enabling precise measurements of the interatomic forces that hold crystalline solids together. The paper Probing the Interatomic Potential of Solids by Strong-Field Nonlinear Phononics, published online in Nature, explains how a terahertz-frequency laser pulse can drive very large deformations of the crystal.
By measuring the highly unusual atomic trajectories under extreme electromagnetic transients, the MPSD group could reconstruct how rigid the atomic bonds are...
Quantum computers may one day solve algorithmic problems which even the biggest supercomputers today can’t manage. But how do you test a quantum computer to...
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
23.02.2018 | Physics and Astronomy
23.02.2018 | Health and Medicine
23.02.2018 | Physics and Astronomy