IRIS opens pupils' eyes to real space research

Pentacam opens eyes to new diagnostic possibilities

Iris neovascularisation in eyes with pseudoexfoliation syndrome.

The iris vascular bed of eyes with pseudoexfoliation syndrome has been studied with electron microscopy. Two of the eyes suffered from painful glaucoma, whereas the third showed normal intraocular pressure. The following changes were observed: (1) deposits of pseudoexfoliation material lying adjacent to the endothelial wall; (2) thin vessel basement membrane, sometimes even interrupted; (3) ext...

Approaching Eyes With Intraoperative Floppy Iris Syndrome

Four years after intraoperative floppy iris syndrome (IFIS) was first described,1 there is still no clear preference among ophthalmologists for the surgical management of these cases, according to a survey conducted last year by the ASCRS Cataract Clinical Committee.2 In fact, when asked to name their preferred single method for IFIS, the most common response (33%) was “always employ multiple s...

Why do animal eyes have pupils of different shapes?

There is a striking correlation between terrestrial species' pupil shape and ecological niche (that is, foraging mode and time of day they are active). Species with vertically elongated pupils are very likely to be ambush predators and active day and night. Species with horizontally elongated pupils are very likely to be prey and to have laterally placed eyes. Vertically elongated pupils create...

The pupils and optical systems of gecko eyes.

The nocturnal helmet gecko, Tarentola chazaliae, discriminates colors in dim moonlight when humans are color blind. The sensitivity of the helmet gecko eye has been calculated to be 350 times higher than human cone vision at the color vision threshold. The optics and the large cones of the gecko are important reasons why they can use color vision at low light intensities. Using photorefractomet...