Cat eye problem/ constipation

Hello vets!! (Urgent) I have recently neutered my bilateral cryptorchid cat (simba). He did pass stool once on the third day but since then he was constipated. I took him to his vet multiple times initially he said to wait and see if he passes stool on his own but then yesterday he decided to give simba enema as he was getting very dehydrated. He did pass stool after enema. Before giving enema, simba was also given IV fluids for dehydration a day before. After IV fluids when I brought simba home later at night I saw he was having slight issue with his vision. I immediately contacted his vet. He said it happened because simba is in a lot of stress and his vision will be normal after he passes stool. The vet did take X Ray of his abdomen where you can see a lot of stool was stuck (pic attached). And the vet also said that his kidney is in stress. Just wanted to get another opinion on his kidneys and vision. Does his kidneys look stressed or not normal. And will his vision recover when he's not in stress/anxiety?

Hello I'm afraid that I don't understand this case well enough but can help a little.  What symptoms is your cat showing that suggest his vision is affected?  - do you know why that has happened?  Your vet may have measured the kidney objectively on the radiograph but that isn't usually how we'd decide that the kidney was under stress.  Rather, your vet may have deduced this information from the level of dehydration that the patient was suffering.  This can be detected on examination (from watching the sinking of the scruff / looking at the gum and eye colour / pulse quality and heart-rate).  Blood and urine tests can help to quantify dehydration further, but sometimes this isnt necessary / the best use of resources at the time.  I hope that something there is useful.

How is Simba getting on now?

He's bumping into thinks and his pupil are constantly dilated but there is slight constriction of pupils under sunlight. The vet said due to multiple vet visits had caused his severe stress and simba is having hard time accepting what had happened to him. The vet did say he had a fast heartbeat and that he is in shock of everything that had happened in the past few days.

Simba is eating, passing urine and stool properly. But it's only his loss of vision that's concerning. Can severe stress cause temporary vision loss as his vet said?

I agree that the loss of vision is concerning and have never seen anything like that happen due to stress alone.  Usually even with stress related disease, one would expect to see symptoms eg high blood pressure leading to knock-on chronic effects.  However, I am not an authority and there are plenty of neurological weirdnesses that I haven't heard of, so it's worth asking your vet if theres anything in the veterinary literature supporting this view, or how one would come to cause the other.  If the pathophysiology is known, I would be interested hear about it.  If not, perhaps they might reccommend a visit or call to an opthalmogist or neurologist who might be able to shed more light on this inttuiging case.

Questions such as 'what could be causing Simba's illnesses?'  'What did we rule out?'  'Is there anything else we need to consider?' - often help owners and vets to better understand an ongoing case.

Okay, I'll be visiting the vet tomorrow to get his suture removed. I'll definitely ask him these questions. Do cats recover there vision if lost due to some not so serious reason?

I can understand your concern as a pet parent. It's essential to address his health issues promptly.