EYES

LOST referenced the image of an eye throughout the series.

An eye can see.

An eye can be deceived.

In some cultures, the eye is the gateway to a person's soul.

In some cultures, dying with eyes open is interpreted as dying in a state of unrest or mission in life unfulfilled. 

The eye is a remarkable bio-mechanical machine.  The basic components of the vertebrate eye are a transparent cornea, an adjustable iris, a lens for focusing, a sensitive retina lining the back of the eye which corresponds to visual light detection, and a clear fluid- or jelly-filled center. The most primitive animals only have one or two eye spots, while many other invertebrates have several simple eyes or a pair of compound eyes.

Common phrases or meanings all have references to LOST's story themes:

"all eyes" is  used to convey that a particular person or thing is currently the focus of public interest or attention;

"before (or under ) one's ( very ) eyes"  or "right in front of one" denotes an unpleasant or destructive event witnessed by a person.

"close (or shut ) one's eyes" is to refuse to notice or acknowledge something unwelcome or unpleasant:

"an eye for an eye and a tooth for a tooth" is used to refer to the belief that punishment in kind is the appropriate way to deal with an offense or crime as set forth in biblical allusion to Exod. 21: 24.

"the eye of the storm" is  the calm region at the center of a storm.

"the eye of the wind (also the wind's eye)" is the direction from which the wind is blowing.

"eyes front" is a military command to turn the head in the particular direction stated.

" bird's-eye view" is seeing something or someone from a different viewpoint.

"give someone the eye" is an informal look at someone in a way that clearly indicates one's sexual interest in them.

"half an eye" is  used in reference to a slight degree of perception or attention: he kept half an eye on the house as he worked.

"have an eye" is to be able to recognize, appreciate, and make good judgments about.

"have (or keep ) an (or one's ) eye on" is to keep under careful observation.

"one's eyes are bigger than one's stomach" means that one has asked for or taken more food than one can actually eat.

"( only ) have eyes for you" means one is interested in or attracted to a specific person.

"have eyes in the back of one's head" is to  know what is going on around one even when one cannot see it.

"hit someone between the eyes (or in the eye )" is to be very obvious or impressive.

"keep an eye out (or open )" is to look out for something with particular attention.

"keep one's eyes open" is to be on the alert; watch carefully or vigilantly for something.

"open someone's eyes" means to  enlighten someone about certain realities.

"see eye to eye" means to  have similar views or attitudes to something

"a twinkle (or gleam ) in someone's eye" is something that is as yet no more than an idea or dream.

"what the eye doesn't see, the heart doesn't grieve over" is a  proverb if you're unaware of an unpleasant fact or situation, you can't be troubled by it.

"with one's eyes open (or with open eyes )" is being fully aware of the possible difficulties or consequences.

"with one's eyes shut (or closed )" means without having to make much effort; easily.