Hello & welcome,
Stop intake of Ibuprofen your friend is taking for pain because in 0.5 % people ibuprofen can not only cause blurred vision
but also diplopia..!
This side effect of ibuprofen is very rarely seen & is transient, returning to normal on stoppage of drug intake. So don't worry about that.
Now for tongue bite
, visit your dentist
to rule of need for suturing if bite injury
is extensive. If injury is self limiting, then only Antibiotics to avoid secondary infection & proper pain killers can be given to you by your dentist or physician only.
Avoid hot food stuff even hot drinks along with spicy items as it may aggravate the pain & intervenes with the healing of wound .
And Don't forget to explain about blurred vision you encountered before your dentist prescribes you any medicine. You should keep a small paper always with you explaining that you are sensitive to ibuprofen ( you can go for hypersensitivity
tests for the same drugs under medical supervision ).