Not that I know of. But there will be behavioral differences. Deaf cats
are more defensive because they're more easily startled. Some will have
a louder voice because they can't regulate their own volume; others will
be mute.

To ascertain for sure whether she's wholly deaf, click your fingernails
(don't snap your fingers; this causes a vibration that any deaf animal
might perceive) in close proximity to each ear and see if she responds.
Also, if she's easily startled if you approach her from behind and touch
her, that's another sure sign.

Some deaf cats have learned to respond to hand signals. Others will
respond to hand-clapping, because they can pick up the vibrations. Using
a flashlight is another way to get her attention safely

According to http://www.messybeast.com/whitecat.htm:

"95% of the general cat population is non-white cats (i.e. not pure
white) and congenital deafness is extremely rare in non-white cats.

"5% of the general cat population is white cats (i.e. pure white).
15-40% of these pure white cats have one or two blue-eyes.

"Of those white cats with one or two blue eyes, 60-80% are deaf; 20-40%
have normal hearing; 30-40% had one blue eye and were deaf while 60-70%
had one blue eye and normal hearing.

"Of the 5% of white cats in the overall population, 60-80% had eyes of
other colors (e.g. orange, green). Of those 10- 20% were deaf and 80-90%
had normal hearing.

"Deaf white cats with one or two blue eyes account for 0.25 - 1.5 of
total cat population

"Total number of cats with white coat and blue eyes account for 0.75 -
2.0% of total cat population

"It is evident from those studies that blue eyed whites exhibit a higher
incidence of deafness than do orange/green eyed whites or non-white
cats! But not all blue eyed whites are deaf and here's why:-

"There is a known link between white coat color, blue eyes and deafness
- but since the coat and eye color can be caused by different genes it
means that only *some* blue eyed whites are deaf. There is a gene/gene
complex which causes white coat, blue eyes and deafness, but not all
cats get their white coat and blue eyes from that particular gene, so
not all white cats will be deaf.

"If the cat is a Foreign/Oriental White, it carries the gene for
'Siamese Blue Eyes' which is not linked to deafness (the gene for
Siamese Blue Eyes is linked to cross-eyes instead). Siamese blue eyes
have a reflective tapetum, but this is depigmented because the Siamese
colour is caused by albinism. This depigmentation gives the red-eye with
flash cameras. Random matings can mean that this gene sometimes appears
in non Oriental-looking cats which have colorpoint cats in their ancestry."

HTH.

I had a white cat which wasn't deaf...until she was about 15 or 16 years
old. It was gradual, I think, and of course age related. one day, I just
realized she never answered to her name anymore :-(

She was an indoor only kitty, and there were few adjustments to make. I
always stamped on the floor, hard, with my foot to let her know I was
entering the room she was in. That worked well. I tried not to startle
her. Due to her age, she wasn't skittish, but I didn't wasn't to stress
her. I always tried to enter her field of vision before I touched her.

I think because it was gradual, and she was older, it wasn't hard on
her.

If a cat is deaf from birth, they won't miss the loss of hearing, but
just as with my cat, steps should be taken to accommodate her deafness.

You can try putting cat beds where she can see the doors(s) to the room,
so she'll see you enter.

Pick a gentle method of waking her from sleep, and always do it the same
way, so she'll know it's you.

Watch for the things that startle or seem to cause stress for her, and
minimize them as much as possible.

It will be a learning experience, but I'm sure that with just a few
adjustments, she will live a long, healthy life. I hope so, anyway.