PATIENT ASSESSMENT & SELECTION
Learning Outcomes
After completing this module you should understand the:
- Ideal candidates for NOCTURNAL™ night lens fitting
- Limitations for fitting patients who are not ideal candidates
- Contraindications for fitting
IDEAL PATIENTS
The following patients are ideal candidates, that should enjoy good quality vision with no need for additional correction
- Patients who achieve a good acuity with a spherical correction up to -5.00D
- Patients with astigmatism less than -1.50 dioptres WTR or -0.75 dioptres ATR. The cyl value should be less than half the myopia i.e. -2.25/-1.00×180
- Patients with flat keratometry readings between 8.40mm and 7.30mm
- Patients with symmetrical corneal topography maps
- Patients with a corneal diameter greater than 11.0mm
- Patients motivated by the freedom night lenses will provide them
- Patients with no presbyopia or who tolerate monovision correction
POSSIBLE PATIENTS
These patients are unlikely to get a full correction, but may be happy with the outcome especially if prepared to top up their correction with over-specs.
- Myopia greater than -5.00 dioptres is likely to result in under-correction
- Refractive astigmatism greater than -1.50 dioptres WTR -0.75 dioptres ATR is likely to remain in the residual refraction
- Astigmatism greater than twice the sphere power ie. -1.00/ -2.25×180 is likely to remain in the residual refraction
- Patients with non-average corneas, large diameter, flat or steep corneas (HVID >12.4, K<7.30mm, K>8.40mm)
- Patients with asymmetrical topography that indicates the treatment zone will form away from the visual axis
- Patients with large pupils may experience discomfort from glare
CONTRAINDICATED PATIENTS
Patients with any of the below are not suitable for lens wear:
- Any patient unable to follow the instructions and safe practice needed for contact lens wear
- Disease, injury, or any abnormality affecting the cornea, conjunctiva, or eyelids
- History of recurrent erosions
- Active corneal or conjunctival infections
- Corneal hypoesthesia
- Allergy to lens care solutions
PRE-FIT PATIENT EXAMINATION
A contact lens examination is performed with the addition of topography screening
- Refraction and acuities
- SE refraction and acuities (this is the anticipated outcome)
Slit lamp examination
- Corneal health
- Conjunctival roughness
Topography assessment
- Measure HVID
- Anticipate treatment zone position
BASELINE TOPOGRAPHY
Ensure you have multiple good quality baseline maps.
Capture should cover the whole cornea with minimal lid/lash shadows.
Ensure no tear film abnormalities.
![Scotlens – scott brown – custom fit lenses – topography capture quality Scotlens - scott brown - custom fit lenses - topography capture quality](http://www.scotlens.com/wp-content/uploads/2024/04/Scotlens-scott-brown-custom-fit-lenses-topography-capture-quality-1024x318.jpg)
Ideal patients will have topography that is spherical (left), or that the toricity is centrally located (middle).
Limbus to limbus astigmatism (right) is less likely to be corrected.
![Scotlens – scott brown – custom fit lenses – topography types of astigmatism Scotlens - scott brown - custom fit lenses - topography types of astigmatism](http://www.scotlens.com/wp-content/uploads/2024/04/Scotlens-scott-brown-custom-fit-lenses-topography-types-of-astigmatism.jpg)
Assess the colour contour skew.
The treatment zone is expected to form in the middle of the yellow/green contour (left).
If this is not centred the treatment zone will not be on the visual axis, and can result in under-correction or induced Rx/aberrations (right).
![Scotlens – scott brown – custom fit lenses – topography colour contour skew Scotlens - scott brown - custom fit lenses - topography colour contour skew](http://www.scotlens.com/wp-content/uploads/2024/04/Scotlens-scott-brown-custom-fit-lenses-topography-colour-contour-skew.jpg)
NB. Very few patients have optimal topography. It is usually best to proceed with fitting unless the patient has high Rx and high visual demands.
ORDER & SCHEDULE COLLECTION
- Provide the NOCTURNAL™ Brochure to your patient. It contains a full explanation of what they can expect wearing NOCTURNAL™ night lenses
- Order the lenses with your login at scotlens.com
- Once you have received the lenses schedule a collection appointment and an early morning review appointment on Day 1
![Scotlens – Module 3 – Order & Schedule Collection – Minimalist](http://www.scotlens.com/wp-content/uploads/2024/04/Scotlens-Module-3-Order-Schedule-Collection-Minimalist.png)
SUMMARY
- Ideal candidates should enjoy good quality vision with no need for additional correction.
- Possible candidates may be happy with the outcome and should be prepared to top up their correction with over-specs.
- Contraindicated patients should not be fitted.
- Good baseline topography is important.
- Provide patients with written information that outlines what they will experience wearing NOCTURNAL™ night lenses.