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Fabian Conrad, Percy Lazon De La Jara, Padmaja R. Sankaridurg, Brien A. Holden; Relative Power Profiles Of Soft Contact Lenses And Their Influence On Central And Peripheral Visual Performance. Invest. Ophthalmol. Vis. Sci. 2012;53(14):4724.
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© ARVO (1962-2015); The Authors (2016-present)
To determine if a variation in the relative power profiles of soft contact lenses (CL) influences central and peripheral contrast sensitivity and visual acuity.
Twenty four myopic participants (24.9 ±4.9 years) wore novel peripheral optical design (ND), commercially available single vision (SV) and medium add multifocal (MF) silicone hydrogel CL (Lotrafilcon B, CIBA VISION, USA). ND lenses were designed to have approximately +2D of relative peripheral power at the edge of the optic zone. Central and peripheral refraction were measured using a modified Shin-Nippon NVision K5001 autorefractor. Central contrast sensitivity (CCS, 2 cycles per degree) and peripheral (30° temporal and nasal visual field) contrast sensitivity (PCS, 2 cycles per degree) and visual acuity (PVA) were assessed using a computer-based test. Central high (HCVA) and low contrast visual acuity (LCVA) were also recorded. Paired t-tests were used to test for differences between lenses and visual field positions.
Only ND lenses showed a shift of the peripheral image shell in the myopic direction whilst correcting central ametropia. HCVA and LCVA of ND lenses was comparable to SV lenses (p>0.05). No significant differences in CCS, PCS and PVA were observed between ND and SV CL. However, MF CLs showed better contrast sensitivity compared to SV lenses centrally for horizontal gratings (p=0.017) and in the nasal visual field for vertical gratings (p=0.026).
Using ND CLs, the peripheral image shell can be shifted in the myopic direction without negatively affecting HCVA, LCVA, CCS, PCS and PVA (when compared to SV Lotrafilcon B CLs). Possible improvements in contrast sensitivity using MF lenses need to be investigated over a wider range of spatial frequencies.
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