Optical coherence tomography to evaluate the interaction of different edge designs of four different silicone hydrogel lenses with the ocular surface

Figures & data

Table 1 Characteristics of the contact lenses used in the study

Characteristic	Acuvue Oasys	PremiO	Air Optix Aqua	PureVision 2 HD
Manufacturer	Johnson & Johnson	Menicon	Ciba Vision	Bausch & Lomb
Diameter (mm)	14	14	14.2	14
Base curvature (mm)	8.4	8.6	8.6	8.6
Material	Senofilcon A	Asmofilcon A	Lotrafilcon B	Balafilcon A
Modulus (MPa)	0.72	0.9	1.2	1.1
Water content (%)	38	40	33	36
Center thickness (−3.00 diopters)	0.07	0.08	0.08	0.07
Edge shape	Knife-edged	Semi-rounded	Chisel-edged	Rounded
Peripheral thickness (−3.00 diopters)	0.07	–	0.12	0.07
Mid-peripheral thickness (−3.00 diopters)	0.19	–	0.19	0.17

Notes: Bausch & Lomb Incorporated, Bridgewater, NJ, USA; Ciba Vision, Duluth, GA, USA; Johnson & Johnson, New Brunswick, NJ, USA; Menicon Co., Ltd. Nagoya, Japan.

Figure 1 Measurement of conjunctival indentation.

Figure 2 Visualization of limbal gaps located at the corneoscleral junction.

Figure 3 Angle of conjunctival indentation was measured by optical coherence tomography for different edge designs.

Notes: (A) Knife-edge design (Acuvue Oasys). (B) Round-edge design (PureVision 2 HD). (C) Semi-round edge design (PremiO). (D) Chisel-edge design (Air Optix Aqua).

Figure 4 Comparison of conjunctival pressure exerted by the lens edge for different edge designs, regardless of the lens power.

Abbreviations: SD, standard deviation; SEM, standard error of the mean.

Figure 5 Distribution of conjunctival indentation according to lens power and edge design.

Abbreviation: D, diopters.

Figure 6 Occurrence of tear film gaps at the limbus according to lens edge designs.

Note: *Significantly different from knife edge (P=0.001) and semi-round edge (P=0.0004).

Figure 7 Distribution of limbal tear film gaps according to lens powers.

Note: P=0.017.
Abbreviation: D, diopters.