Glossary of Terms Used In Laser Eye Surgery
ASA (Advance Surface Ablation):
Laser surgery applied to the eye surface such as PRK, EpiLASIK and LASEK.
– Astigmatism occurs when the cornea is distorted or elliptical rather than
round. This creates a blurred image for both distant and near objects.
Best Corrected Visual Acuity (BCVA)
- The best possible vision a person can achieve with corrective lenses measured
in terms of Snellen lines on an eye chart.
- Surgery performed on both eyes on the same day.
– The cornea is sometimes referred to as the “window of the eye”
provides most of the focusing power when light enters the eye. The cornea is
composed of five layers of tissue. This is the part of the eye reshaped by laser
– A custom treatment is a wavefront-guided procedure.
However, every procedure we perform at Queensland Laser Vision is a “customised”
procedure as your examination is a highly detailed, personalised evaluation. We
carefully assess your eyes with our wavefront technology, which is the NIDEK OPD
III, and then we adjust and customise your treatment depending on your pupil
size, refraction, corneal topography and all other test results.
The ability to adjust the NIDEK Quest Excimer Laser’s optical zone size and
transition zone allows for a truly customised treatment. The adjustability of
the laser is one of the most important factors in providing a customised
treatment for each individual patient.
– A measurement of the degree to which light converges or diverges; also a
measurement of lens refractive power.
– The outer layer of the cornea that acts as the eye’s protective layer
– The ideal eye would have no aberrations, with light entering the eye focusing
to a perfect point on the retina. Higher order aberrations are very subtle
Our objective in your treatment is to minimise your resulting aberrations. With
the NIDEK Quest Excimer Laser technology, we can reduce or minimise halos and
glare and higher order aberrations. Higher-order aberrations do not always
– Implantable Contact Lens (ICL) is often used to correct vision in patients
unsuitable for LASIK (thin corneas, high near-sightedness, etc)
They are designed to correct visual problems much the same way as an external
contact lens. Unlike the external contact lens, Implantable Contact Lenses are
placed inside the eye behind the iris (coloured part of the eye) and in front of
the eye’s natural lens.
Unlike LASIK, the ICL is a reversible procedure. Useful Link –
– LASIK (Laser-In-Situ Keratomileusis) is currently one of the most frequently
performed elective procedures.
is a highly effective procedure that is suitable for treating patients with
short-sightedness and astigmatism.
LASIK, a protective hinged flap is created and lifted by the surgeon. A computer
controlled cool beam of light from the Excimer laser is then used to reshape the
front surface (cornea) of the eye.
– The lens is the clear structure located behind the pupil. Its primary function
is to provide fine-tuning for focusing and reading, which it accomplishes by
altering its shape.
– is the removal of the natural lens of the eye and replacement with an
artificial lens. Normally, the natural lens is removed only when it has become
cloudy enough to obstruct vision, for example, when a cataract has formed in our
latter years of life. The lensectomy procedure, however, can also be used to
reduce the dependence on spectacles before cataract formation. Longsightedness
and presbyopia can be treated by this procedure.
– An instrument, placed in the eye before surgery, to hold the lids apart,
eliminating the possibility of blinking.
– Long-sightedness is a refractive error in which you see better from a distance
than close. An eyeball that is too short to focus light on the retina causes hyperopia.
– Also called refractive error; includes myopia (short-sightedness), hyperopia
(farsightedness) and astigmatism.
– Myopic and astigmatic people who are suitable for Laser surgery, may be
suitable for monovision correction.
With monovision, one eye is corrected for distance and the other eye is
corrected for near, providing clear vision for both distance and near vision.
This kind of correction is usually done for people around 40 years of age to
reduce the need for reading glasses.
– as the eye ages, it naturally loses focusing power and reading glasses are
required from about 40yrs of age onward.
– Photo Refractive Keratectomy The surface layer of the eye (the epithelium) is
first removed and the laser then ablates the deeper stromal tissue. The amount
of corneal tissue to be removed is directly dependant on the size and type of
PRK has been used successfully on thousands of patients worldwide.
– The pupil is the black circle in your eye.
The primary function of the pupil is to control the amount of light entering
your eye. When you are in a bright environment, the pupil becomes smaller to
allow less light to pass through. When it is dark, the pupil expands to allow
more light to reach the back of your eye.
– The retina consists of fine nerve tissue that lines the inside wall of the eye
and acts like the film in a camera.
Its primary function is to capture and transmit images.
– Short-sightedness or myopia is the result of the eye’s lens system being too
powerful relative to the length of the eye.
Myopic people can see well up close but distant objects like street signs or the
television appear out of focus.
Our laser and computer technology can correct low, moderate and high levels of
Uncorrected Visual Acuity (UCVA)
– The best possible vision a person can achieve without corrective lenses
measured in terms of Snellen lines on an eye chart.
Wavefront Diagnostic Equipment
– Wavefront is helpful in determining if you have significant pre-operative
higher order aberrations and this information can be used to determine the best
way for treating your eyes.
Queensland Laser Vision we use the Nidek OPD III-Scan as it very accurately
measures higher order aberrations and corneal topography. These results can then
be used in conjunction with the NIDEK Quest Excimer Laser to minimise the
creation of new aberrations.
We provide a
thorough assessment process
We only perform the
right procedure that is right for you.
Contact Queensland Laser Vision
Today - Book Your Assessment
1800 66 2020 or 07 3831 8299