When a cat seems off balance, has difficulty walking straight or holding their head upright, having what appears to be blindness - it can very well be a nutritional deficiency (especially thiamine). In a feral born kitten like this it's seen more than in kittens born to in-house kittens with loved and well fed mom's. There are various degrees of affectation and not all symptoms need to be present.
http://www.petplace.com/cats/thiamine-deficiency-in-cats/page1.aspx
Sometimes a nutritional deficiency is caused by too much of any one food, especially fish/seafood for cats. Many people mistakenly think that discount cans of tuna are sufficient for their pet (it doesn’t matter if it’s top of the line fresh fish) - too much fish for a cat is a health threat.
http://www.sniksnak.com/cathealth/howto9.html
Other problems that may contribute to presentations similar to malnutrition or deficiencies may be seen here
http://www.fabcats.org/wobbly_kittens.html
To make sure you’re feeding right, a vet who has dedicated her practice to felines and feline nutritional needs beyond the commercial product sales pitches explains how to make your own cat food, compares different products and details exactly what cats need, why and what can happen if they don’t consistently get it. www.catinfo.org
Don't give up on this little one --- I have seen events like this with some very good outcomes.
Measuring erythrocyte transketolase activation after the addition of thiamin pyrophosphate is the standard (biochemical) test for thiamin deficiency. Some clinicians who see a large number of feral cats will know upon presentation that the cat is nutritionally deficient.
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