Human Life Research on ISS US Orbital Segment

CORNEA-G Experiment

CORNEA-G experiment is included in the research program conducted onboard the ISS by spaceflight participant Richard Garriott within the framework of the GTA project. The experiment is to be performed under US medical program on the US Orbital Segment using the USOS onboard equipment.


Confirming the hypothesis that human eye-sight is not subject to changes under exposure to zero-gravity.


  • Evaluating potential changes in the shape of cornea, visual acuity, eye pressure.
  • Obtaining information about possible causes of cosmonauts' developing longsightedness and enlargement of eye's uveal tract.

Science Hardware Used:

The experiment uses the US Orbital Segment onboard hardware (a set of simple lenses (-2D, -1D, +1D, +2D) and the on-board computer).

During each session the following operations are performed: measuring visual acuity, measuring amplitude of accommodation, checking improvement in eye-sight when simple lenses are used, and filling out the questionnaire about visual sensations and difficulties.
In the course of the visual acuity measurements, long-range and close-range visual acuity charts are plotted. Determined in the measurements of accommodation amplitude is the eye's ability to clearly read a text at close-range. The eye-sight improvement tests use four simple lenses (-2D, -1D, +1D, +2D). The test is to be done for each eye separately.
To be entered into the electronic questionnaire are all the data on the eye-sight tests, as well as any sensations occurring in the eyes in the course of day-to-day activities through the entire space flight.

Experiment Results:

Data entered into the electronic questionnaire and downlinked from ISS to Earth.