THE MAGNIFIER IN THE EYE
The new option for patients with macular disease
What is SML?
SML is a bifocal Add-On IOL with a specifi cally designed central optic area providing high addition power of +10.0D, developed by Prof. Gabor B. Scharioth.*
SML is intended for monocular implantation in the better-seeing eye, without aff ecting distance vision or visual field.
- Add-on with simple bifocal design
- Central 1.5 mm diameter optical zone with +10D
- Peripheral zone optically neutral
- Combines proven add-on technology
- With sufficient magnifi cation
- Without affecting distance vision or visual field
- Sufficient magnification
- Easy and safe surgery
- Independent from lens status
- No reduction of visual field
- Not affecting distance vision
SML is Safe
- Proven Add-On Platform present on the market since 2010; over 2500 pcs implanted
- SML is stable in the sulcus
- Without IOP elevation
- No iris capture possible
- No chafing effect
Using so – called Near Triad Reflex:
miosis – accommodation – convergence
Due to the eff ect of near vision miosis, the central optical portion - providing the magnifi ed image - will dominate when the patient focuses on near objects only but will not infl uence far vision signifi cantly when the patient focuses on distant objects through a dilated pupil.
Pict 1: Patient´s eye with dilated pupil
When the patient focuses on a distant object, the pupil is dilated and there is enough space around the central optical region for light rays passing through the peripheral optical portion of the secondary IOL as well.
Light rays originating from a distant object that pass through the peripheral optical region and form the image of the distant object on the retina (solid lines) will dominate the patient‘s perception over light rays passing through the central optical region that do not focus on the retina (dashed lines).
Pict 2: Patient´s eye with constricted pupil
When the pupil is constricted, light rays are restricted mainly to the central optical region of the secondary IOL, thus providing a magnified image on the macula. This is the case when the patient focuses on a near object, for example reads a newspaper or a price tag, and the pupil is constricted due to the near triad reflex.
The image thus formed on the retina is magnified compared to the image formed of distant objects.
This feature enables the patient‘s eye to resolve the image in case of AMD as well.
Due to the relatively high refraction of the central optical region compared to the basic lens power, sharp vision is achieved at a very near distance (d), which is typically about 15 cm.
How does SML work?
SML uses the best and most sensitive part of retina – THE FOVEA – the highest concentration of CONEs.
Both color vision and highest visual acuity is attributed to cones.
Cones are concentrated in the fovea. Both color vision and highest visual acuity is attributed to cone cells.
During visual examination of small details, light is focused onto the fovea centralis.
Rods are absent from the fovea but abundant elsewhere in the retina. They are responsible for night vision, our most sensitive
motion detection, and our peripheral vision.
Thus, with non-foveal/macular regions of the retina we can detect motion and contours under scotopic conditions but
CANNOT READ IN THE DARK. That is why SML does not deflect light away from the fovea.
SML, by MAGNIFICATION, uses the rest of the damaged FOVEA - the best and most sensitive part of the retina - to enable reading.
Mode of Action: MAGNIFICATION
MAGNIFICATION (about 2-times)
Dark spots covering the text represent damaged macular areas. The SML magnifies the text approximately 2 times but the size of the dark spots remains the same because the SML does not magnify the damaged parts of macula.
Thus the SML enables patients with AMD to read the text.
Enlargement by zooming
For whom is SML recommended?
- SML targets solely pseudophakic patients with advanced DRY AMD, off ering them a convenient, simple and safe solution to restore their near vision impaired by AMD.
- SML - New Technology focuses on patients with advanced stage AMD but it might be helpful for patients with other macular diseases as well, e.g. myopic maculopathy, diabetic maculopathy or hereditary retinal diseases.
- Two thirds of patients with advanced AMD and visual acuity of 0.3 or less are pseudophakic - these patients might benefi t from SML.
Surgery may be performed simultaneously with cataract surgery, but preferably cataract surgery should be done fi rst and following a repeated postoperative VA testing, SML can be implanted later on if the patient is still dissatisfi ed.
THE SML IS POTENTIALLY SUITABLE FOR A LARGE PERCENTAGE OF EYE SURGEONS. NO EXTENSIVE TRAINING IS REQUIRED. THERE IS NO LEARNING CURVE.
DRY AMD with pathological changes in the retinal pigment epithelium (RPE) and Bruch‘s membrane (a collagen-rich extracellular matrix between the RPE and choroidal vasculature) including the presence of ophthalmoscopically visible focal yellow deposition of acellular, polymorphous debris called drusen between the retinal pigment epithelium and Bruch‘s membrane.
Patient with AMD implanted with SML
85 old male, single eyed, after 13 intravitreal injections. SML implanted in 2014. Preop BCDVA 0.12, Radner 12 (40 cm and 15 cm). Postop 4 weeks BCDVA 0.12, Radner 4 (sc in 15 cm) Courtesy of Prof. Gabor B. Scharioth.
Almost 30M people worldwide suffer from AMD
Age-related macular degeneration (AMD) aff ects 8.7 % of the world‘s population and is the most common cause of irreversible blindness in both developed and developing countries, particularly in people older than 60 years.
Its prevalence is likely to increase as a consequence of
- Growth of elderly populations
- Environmental factors
- Cataract and pseudophakia are the most common eye conditions to be associated with AMD
- Two thirds of patients with advanced AMD and visual acuity of 0.3 or less are pseudophakic - these patients might benefit from SML
AMD can be generally divided into two types: Dry AMD (90–95 %) and Wet AMD (5–10 %)
AMD is the leading cause of visual impairment in western countries
The most common causes of blindness in developed countries
Treatment of AMD
There have been signifi cant advances in the management of exudative (wet) AMD with the introduction of anti-angiogenesis therapy, and patients now have eff ective treatment options that can prevent blindness and, in many cases, restore vision.
CURRENTLY THERE IS NO DRUG AVAILABLE FOR DRY AMD AND TREATMENT POSSIBILITIES ARE LIMITED TO LOW VISION REHABILITATION (LOW VISION AIDS AND LOW VISION INTRAOCULAR IMPLANTS)
SML - New Technology focuses on patients with advanced stage AMD but might be helpful also for patients with other macular diseases as well, e.g. myopic maculopathy, diabetic retinopathy or hereditary retinal diseases.
SML - Surgery
- Using highly advanced modern surgical techniques
- Easy implantation: feasible for standard cataract surgeons, accessible to every cataract surgeon
- Microincision (2.2 mm)
- SML is placed in the sulcus
- The procedure takes only 10 minutes
- Pseudophakic patients
- SML is implanted MONOCULARLY in DOMINANT (better-seeing) EYE
Which patients are suitable for SML?
- Any patient with DRY STAGE AMD complaining about near vision diffi culties
- Other conditions may include diabetic retinopathy, myopic retinopathy, hereditary retinal diseases
- Distance vision better than 0.1 (ETDRS, decimal)
- Motivated patient
- PSEUDOPHAKIC PATIENTS or patients who are candidates for cataract surgery
SML: Microscopic Magnifi er in the EYE
Advantage of SML
Magnifying IOL system works, but not widely adapted because of
- Large incision
- Diffi cult surgery
- Might affect distance vision
- Affects visual field
- Only in combination with cataract surgery
- Limited magnification of intraocular
- Galilean telescope
- High cost
- Contraindicated in single-eyed patients (?)
- Limited reversibility
SML - New Technology focused on patients with advanced stage AMD
- Microincision (2.2 mm)
- Easy and safe surgery
- Distance vision not affected
- Visual field not affected
- May be implanted in pseudophakic or in patients
- or those who are candidates for cataract surgery
- Aff ordable (signifi cantly lower cost)
- May be implanted in single-eyed patients
What kind of preoperative tests are needed for SML indication?
Simple preoperative SML candidate tests
- Near vision at 40 cm (+2.5D) vs 15 cm (+6.0D)
- Patient should understand the principle of reduced reading distance and feel improvement of near vision with +6.0
- PSEUDOPHAKIC PATIENT
SML IS POTENTIALLY SUITABLE FOR A LARGE PERCENTAGE OF EYE SURGEONS. NO EXTENSIVE TRAINING IS REQUIRED. THERE IS NO LEARNING CURVE.
Testing by Radner reading chart
SML in Life – self-contained patient
The SML is not recommended in any of the following conditions:
- WET AMD (active/exudative stage)
- Zonulopathy, subluxation, aphakia
- Progressive glaucoma
- Active iris neovascularisation
- Shallow ACD