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Corneal topography before wearing scleral lenses as measured with Pentacam (A) and OCT illustrating good central clearance (B), edge assessment of nasal (C) and temporal location (D) in case 1. The blue arrow corresponds to the directionality of the scan in relation to adjacent OCT cross section.
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Figure 1A shows the corneal topography of his left eye using Pentacam HR (Oculus Inc., Wetzlar, Germany). Inc, Shenzhen, China) again (Figure 1B). Initially, the 8.30 mm base curve lens did not provide ample apical clearance, so multiple steeper lenses were trialed until an apt vault of 280 mum using a ruler of the picture over the steepest part of the cornea was achieved. Appropriate apical clearance with an 8.00 mm base curve, 14.7 mm diameter lens is showed with an AS-OCT in Figure 1B. After the lens settled for four hours, alignment improved as seen on slit lamp and AS-OCT (Figure 1C and D).
Comparison of lens design between onefit 2.0 and onefit A.
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As well as, it was transformed into the following form than the original model which is Onefit 2.0 to fit better for Asian; smaller diameter and prolate shape, in other words lower sagittal height (Figure 2). It is a geometry design with anterior aspheric surface that is specified to made to Asian, reducing only central clearance while maintaining the peripheral limbal clearance and edge alignment as shown in Figure 2.
PMC8290849_02
Corneal topography before wearing scleral lenses as measured with Pentacam (A) and OCT illustrating good central clearance (B), edge assessment of nasal (C) and temporal location (D) in case 2. The blue arrow on the left means the central blue line of OCT cross section in the right photo.
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Her corneal topography of the right eye showed significant astigmatism and a superiorly displaced corneal apex (Figure 3A). The apical cornea and landing zone relationships were assessed with AS-OCT, as seen in Figure 3B-D).