October 1989
Volume 30, Issue 10
Free
Articles  |   October 1989
Y cells in the cat retina are more tolerant than X cells to brief elevation of IOP.
Author Affiliations
  • T D Shou
    Department of Biology, University of Science and Technology, Hefei, Anhui, People's Republic of China.
  • Y F Zhou
    Department of Biology, University of Science and Technology, Hefei, Anhui, People's Republic of China.
Investigative Ophthalmology & Visual Science October 1989, Vol.30, 2093-2098. doi:
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      T D Shou, Y F Zhou; Y cells in the cat retina are more tolerant than X cells to brief elevation of IOP.. Invest. Ophthalmol. Vis. Sci. 1989;30(10):2093-2098.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

The responses of X and Y type retinal ganglion cells were extracellularly recorded from the cat optic chiasm or tract before and during brief intraocular pressure (IOP) elevation. The responses of both X and Y cells to stimulus flashes decreased monotonically with increase of IOP. Y cells had significantly higher tolerance to IOP than did X cells. This systematic difference was independent of the cell's retinal position. The findings support the conclusion that during brief IOP elevation pressure-induced ischemia is the main factor causing a decrease in ganglion cell responsiveness. Our findings also suggest a means of selectively eliminating the contribution of X cells to visual function. At moderate levels of IOP elevation X cells, but not Y cells, virtually cease to function.

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