Summit Apex Plus Laser System
NOTE!: This laser is no longer
The Summit OmniMed Laser System was the first excimer laser system
approved by the US FDA for use on refractive patients in 1995.
Although highly advanced by 1995 standards, the fundamental laser
delivery has changed only cosmetically since that time.
The current Summit Apex Plus excimer laser is a broad beam laser that is
maximally capable of producing a 6.5 mm optical zone.
the Summit technology is now considered a “dinosaur” by most refractive
surgeons the laser technology itself is less expensive that the newer more
advanced laser systems. This
decreased cost can be transferred to the patient in the form of a less
expensive procedure. It should
be noted that Summit recently paid millions of dollars to purchase
Autonomous Technologies, thereby demonstrating that, even at a corporate
level, Summit does not believe in their Apex platform as the technology for
today or for tomorrow.
Summit Ablation Profile
- No eye tracker either manual or automated.
Surgeon must physically move the patient’s head to compensate for
involuntary or voluntary eye movement during the laser procedure.
- No computerized high-speed eye tracker is available.
Excellent surgical outcomes are subject to the variable nature of
patient fixation. Eye movement
(either voluntary or involuntary), head bobbing from pulsations from the
heart and patient breathing all serve to compromise the visual outcome.
It should be understood that all patients exhibit erratic involuntary
eye movements during a laser procedure regardless of their skills of
concentration. Irrespective of
the surgeon’s skill or experience, these are variables that cannot be
- Surface profile more irregular and “rougher” than more
advanced laser systems due to ridging by the metal diaphragm, lack of
homogeneity of the laser beam and variability in the density of the
ablatable plastic disc. Surface
irregularities stimulate corneal healing resulting in proportionately
greater variations in refractive results, irregular healing, optical
aberrations, and poorer predictability.
- Intra-operative eye movement by the patient routinely results in
macroscopic irregularities on the cornea.
As a consequence, the Summit Apex Plus surface profile is ultimately
more irregular than advanced eye-tracking laser systems due to ridging
caused by this erratic eye or body movement by the patient.
Surface irregularities stimulate corneal healing resulting in
proportionately greater variations in refractive results, irregular healing,
optical aberrations, and poorer predictability.
- More prone to create unwanted side effects such as nighttime
glare or halos due to limitation of a 6.0 to 6.5 mm optical zone. Treating to 8 mm or larger is ideal.
- Unable to treat combined farsightedness and astigmatism.
This is because it is difficult to perform farsighted corrections
without an eye tracking system. Farsighted
laser ablation times are typically on the order of minutes.
Patient movement due to involuntary eye movement or loss of fixation
on the blinking diode light can result in de-centered treatments, induced
irregular astigmatism and loss of vision.
- Fails to provide the surgeon with
the ability to “enhance” over corrections especially those with residual
astigmatism. As a consequence,
the Summit Apex Plus system is unable to effectively treat this surgical
complication thereby leaving the patient with sub-optimal vision.
Very difficult to enhance over-corrected nearsighted patients because
lower limit for hyperopia is +1.50 diopters.
The latter patients must either wait for further FDA approval for the
Summit system or pay additional fees to have the correction on a more
advanced laser system.
to finely adjust the laser system to correct small degrees of refractive
error. As a consequence patients may
often be left with visually significant amounts of residual refractive
error. Patients must be willing
to accept the fact that although they will be “free” of glasses or
contact lenses, their uncorrected vision may not be as good as their vision
to compensate for rotational eye movements during the laser procedure
thereby often compromising the lasers accuracy in treating astigmatism.
Ignoring rotational eye movements ultimately results in less accuracy
and less predictability in the surgical outcome.
“hinge” protection software capabilities increasing the chance
for laser damage to the hinge area of the corneal flap during LASIK surgery.
generated at the corneal surface by a large laser beam appears to be greater
than with small spot scanning laser technology.
This heat may cause increased damage to the cellular structure of the
cornea and either delay or compromise corneal healing.
- Summit Apex Plus system is more prone to develop central
“islands” or surface irregularities due to poor laser beam homogeneity,
laser “plume” shadowing or corneal fluid migration than small beam
scanning laser systems. These
are problems which chronically plague broad beam laser technology
- Significant acoustic shock wave damage compared to other laser
systems resulting in more potential damage to the crystalline lens, retina
and other delicate eye structures located deeper in the eye.
- Mechanically unstable optical system can result in misalignment
of laser optics resulting in poor or unpredictable refractive outcomes
to Summit Web Site – www.sum-tech.com