Although I have no academic answer to this question, my experience in teaching meditation for many years (I am not a doctor), during which all of my clients have displayed evidence of stress and many have displayed symptoms of anxiety, is that there is no particular relationship with visual perception, either causative or demonstrative. A few clients have associated their anxiety with imagined or perceived "bright" or "colored" lights, but since stresses frequently contain multiple components, I don't consider such an association to indicate anything fundamental about the nervous system. Sometimes a negative finding contains real information, so I hope this helps the questioner.

I'm unsure of any link between stress and and anxiety and visual perception; that said, there is an abundance of research indicating that the perception of fear enhances low-level vision, generally - an evolutionary account of this effect is that we simply need to be aware of our surroundings if there is something to be feared.

I've always been interested in an individual differences approach to psychology, that is, why might you perceive something different than I would? It would be interesting to see how perceiver affect (or in your case, stress / anxiety) modulates vision.

I don't have a significant amount to add here, but here's a link to a recent conference paper by a former student:

http://www.journalofvision.org/content/14/10/1358.short

I've found that people who score high on tests of anxiety are more sensitive to the expressions of anger and happiness on male faces.  And especially so if they are an anxious male. In preparation for J. of Indiv. diffs. and personal.

Glenda, What is the antecedent of 'they' in "especially so if they are an anxious male"? It's ambiguous.

Physiological stress and narrowing of attention can be determined by the pupils of the eye. Their size reflects the amount of narrowing of focus related to brain/vision engagement. Optometrists and ophthalmologists measure pupillary size. Have a look to see what is used.

What aspects of visual perception do you mean?  The field is very large.  Do you mean feature detection, target acquisition, tracking, object motion, MT area neural responses, etc... (the list is large).  

attentional focus. have a look at nideffer stuff on attention. Then look at some of the optometric literature about pupil size and stress.

An interesting, free-ranging conversation. As a meditation teacher, I'm exclusively interested in dissolving and eliminating all stress, anxiety, and other negative effects that limit a person's functioning in life, that limit or prevent their natural experience of peace. love, and happiness. Nevertheless, I see the value of academic reasoning and research into all the topics that we are all raising here. While I recognize the value of research, I remain focused on directly helping people live better by eliminating their stored stresses so the nervous system can function fully and properly.

While pupil dilation measures may no doubt exhibit acute responses to, say, quick fear driven autonomic responses, they are still reflexive.  Thus, they are not necessarily indicative of 'perception', as the term is loosely being used.  Again, define what is meant.  

Are you particularly interested in physiological responses that, for example, might be brought on by heightened stress factors which, in turn, will increase a Cortisol trajectory.  This is a question that gives solid footing on bottom-up, sensory driven responses.  

Or, on the other hand, are you interested in top-down  processes (i.e., expectations) involving anxiety or stress, and how they influence someones perception of something?  For example, people who report being fearful of heights might judge the steepness of a cliff greater than those who are not afraid of heights. For this type of work, I suggest you see the work by Dennis Proffitt or Jessica Witt.

Justin raises a good point. Are you interested in the stress modulation of the exclusive physiological processes during visual perception (arrival of the light at the lens - transformation at the retina into nerve impulses - and finally processing in the visual cortex)? Or do you want to know how the overall perception (with all senses) of a visual scene is influenced by earlier build contextual associations? 

I want to know the overall aspect of visual perception to stress or fear.. people with autism they won't have much social interaction and eye contact with others and some people first time seeing one person they get nervous and fear to talk to them.. there what causes the visual perception to fear or nervous..

If you look at what people with autism say about themselves they report too much stimulation, information overloading and overwhelm. There is even a severally autistic girl who has learnt to communicate via typing, she tells of light sensitivity, all over body pain and how OCD type behaviour 'interrupts' pain and discomfort biofeedback.

We humans only see a tiny portion of the visible spectrum, who knows what else some people see when they look at us. For most of us its not what we see but what meaning we attach to what we see. Certainly doctors in white coats can evoke a lot of fear for some simply based on their past experience. I suggest you kindly and patiently ask them to speak for themselves even if its just little yes or no indications to questions.  

Major cause of stress and anxiety is anyone's self, unable to recognize its own limitations but craving for more.

While I can't answer as to objective measures such as field of vision, focus, visual acuity, or saccade characteristics, I can say that we tend to have a narrower visual recognition of the world around us when we are stressed or anxious.

That basically means that we (1) see events that did not happen, and (2) do not see other events that do happen.

Furthermore, events and phenomena are interpreted according to their effect on "me" when we are anxious, due to strengthening of ego.

All of these subjective yet impactful factors improve when we practice effective mental techniques that eliminated stress stored in the nervous system, such as transcending (NSR), according to subjective reports of practitioners. The dramatic reduction in state and trait anxiety produced by practicing NSR can be measured objectively, for example by using the STAI psychological inventory.

I hope this helps.

Maybe this research proposal would help you to connect them

kind regards