VisiTryBlue is a vital
dye, used in matured cataract surgery, which stains the anterior
capsule and fibrous tissue to enable the surgeon to see the capsule
clearly. VisiTryBlue is a sterile preparation of trypan blue combined
with sodium chloride and buffer solution.
care must be taken using VisiTryBlue or any of its components on
patients who are hypertensive.
VisiTryBlue is well tolerated following intraocular injection into
the anterior chamber of the eye during cataract surgery.
Mild postoperative inflammatory reactions may occur in some cases.
During animal experiments, teratogenic and/or mutagenic effects have
been reported after repeated and/or high dose intraperitoneal or
intravenous injections with trypan blue. Therefore, do not use trypan
blue in pregnant women.
To use VisiTryBlue, first
inject air into the anterior chamber using a 26-gauge needle in
the area where the second site is made. This prevents water-like
dilution of the dye. Withdraw VisiTryBlue from the vial into a
tuberculin syringe, which is then injected into the anterior chamber
between the air bubble and the lens capsule. Keep the needle bevel
down so the injection is made in a drop format, and the whole capsule
gets stained. If part of the capsule remains unstained, inject
a drop in that area until it gets stained. Wait for a minute for
staining of the anterior capsule to occur. Next, inject the viscoelastic
into the anterior chamber. This will distend the eye so that when
you make a clear corneal incision, the eye will be tense and you
can create a good valve. Use a straight rod to stabilize the eye
with the left hand and with the right hand make a clear corneal
incision or scleral incision. Inject viscoelastic inside the eye
to remove the air bubble and the VisiTryBlue. Now rhexis is started
with a needle or with a forceps. You will see the contrast between
the capsule, which has been stained, and the cortex, which is not
stained. The rhexis is continued and finally completed. When the
rhexis is complete, the stained anterior capsule lying in the anterior
chamber can be seen.