視差 is read as しさ (shisa) and means parallax.
しさ
shisa
にっしんしさ
heliocentric parallax
ちしんしさ
geocentric parallax
にっしゅうしさ
diurnal parallax
ねんしゅうしさ
annual parallax
しや
field of vision
してん
visual point (position of the eye in calculations of optical instruments)
しりょく
eyesight
しさつ
inspection
しちょう
(public) attention
しせん
one's line of sight
しかい
しちょうりつ
ratings (e.g. of a television program)