Another factor in detecting flicker is peripheral vision. The human eye 
is most sensitive to flicker at the edges of our field of view, and 
least sensitive at the center of gaze (the area being focused on). As a 
result, the greater the portion of our field of view that is occupied by 
a display, the greater is the need for high refresh rates. This is why 
computer monitor CRTs usually run at 70 to 90 Hz, while TVs, which are 
viewed from further away, are seen as acceptable at 60 or 50 Hz (see PAL 
and NTSC.)

md wrote:
> AS wrote:
>> As pastebiu (t.y. matau pastoviai ir mane erzina bei akis dirgina) 
>> plazmu mirgejima is bet kokio atstumo. Kazkada bandziau apie tai 
>> mineti pries kelis menesiukus, tai visi pro sali praeinantys kepurem 
>> apmete. Bandziau pajungineti 100 ir 50 Hz. Na, su 50 ne tai kad mirga, 
>> bet is viso ziureti neimanoma; per mirgesi ir vaizdo nematau. Siaip 
>> kiek parduotuvese uzeinu plazminiu, visus pamaigau, vis ieskau 
>> nemirgancio. Jei rasciau, pirkciau, bet kol kas neradau.
> 
> 
> Elementaru - tamsta turi labiau isvystyta periferini regejima. Zmogaus 
> akis pastebi mirgejima periferineje zonoje kur kas geriau negu ziurint 
> tiesiai i objekta. Todel praktiskai visi pastebi plazmu mirgejima jeigu 
> ziuri ne tiesiai i ekrana, bet pro sali. Taciau yra zmoniu, kurie 
> pastebi mirgejima netgi ziuredami tiesiai i ekrana. Man pvz. reikia 
> ziureti i 42" plazma bent is 4m, kad mirgejimas neerzintu - t.y. ekranas 
> tampa pakankamai mazas, kad nepakliutu i periferines regejimo zonas.
> 
> Todel atsakymas ar plazma mirga ar ne yra - taip, plazma mirga. Taciau 
> ar tas mirgejimas trukdo ziureti priklauso nuo konkretaus zmogaus, 
> teliko modelio ir atstumo is kurio ziurima.