e32 Poster abstracts / Contact Lens & Anterior Eye 36 (2013) e16–e46

Results: The respective photopic and mesopic pupil sizewere 4.45 ± 0.56 and 6.02 ± 0.68. Binocular corrected VA were0.05 ± 0.05 and 0.15 ± 0.05 LogMAR for high and low contrastdistance VA, 0.17 ± 0.08 and 0.26 ± 0.08 for high and low con-trast near VA respectively. The mean of near steroacuity (secof arc)and decentration(mm) were 52.03 ± 42.70 and 0.42 ± 0.15.There was correlation between photopic pupil size and high con-trast near VA(r = 0.26,p = 0.04) and there was correlation betweenweighted effect of pupil size and decentration and high contrastnear VA(r = 0.28, p = 0.03).

Conclusions: Simultaneous vision multifocal contact lensesprovide good visual acuity at distance and near, functional interme-diate vision and good near stereoacuity. Distance and near VA weresignificantly increased with wearing time during 1 month followup period. The low and med add of MFCL preserve good opticalperformance than hi add under real life conditions.

http://dx.doi.org/10.1016/j.clae.2013.08.110

48Binocular summation of presbyopic contactlens corrections

Pete Kollbaum (OD, PhD, FAAO, FBCLA) ∗, RyanMcGiffen (BS), Martin Rickert (PhD), JaniceTarrant (OD, PhD), Paul Chamberlain (Bsc(Hons),MCOptom)E-mail address: kollbaum@indiana.edu(P. Kollbaum).

Purpose: The purpose of this study was to compare the binoc-ular summation of presbyopic contact lens corrections.

Method: Landolt-C (20/100) targets were used to measure thecontrast threshold of ten healthy, non-cyclopleged, high specta-cle add (> + 2.00D) subjects while wearing monovision (MV)(+0.75and +2.00D), lotrafilcon B low and high add multifocal (MF), andomafilcon A MF lenses. Testing occurred in a custom haploscopeusing custom software at distance, intermediate and near targetvergences. A binocular summation ratio (BSR) was calculated as theratio of monocular dominant eye performance to binocular perfor-mance. Mixed effect models were used to determine the effect oflens type conditioned on eye and viewing distance and the marginaleffect of eye within each lens type.

Results: At distance the omafilcon A lens had a median BSR[Q1, Q3] of 1.12 [1.06, 1.20], which was in close agreement withthe lotrafilcon B high (1.19 [1.08, 1.29]) and low (1.15 [1.02, 1.42])add MF lenses. These three lenses had higher BSRs than either theMV + 0.75D (1.00 [0.97, 1.05]) and

MV + 2.00D (1.02 [0.84, 1.05]) lenses. Unlike some previousreports, BSRs did not generally fall below 1 (indicating inhibition)with high (e.g. +2.00D) levels of monocular defocus.

Conclusions: A MF correction in the presence of a small amountof defocus in the non-dominant eye provides binocular summa-tion similar to bilateral MF corrections, but better summation thanhigher add MV corrections. However, binocular summation willvary amongst the presbyopic correction alternatives, with perfor-mance varying by viewing distance.

http://dx.doi.org/10.1016/j.clae.2013.08.111

49The effects of two different daily soft contactlenses on ocular straylight

Giancarlo Montani (Dip Optom) ∗

E-mail address: montani.gc@libero.it.

Purpose: To quantify the effect of two daily wear disposable softCLs on ocular straylight (OS), and on high (HCVA) and low contrast(LCVA) (10% Michelson) visual acuity.

Method: In this prospective, non-randomised, contralateralcomparative study were involved 25 no contact lens wearers withspherical refractive error between -1.00dt and -6.00dt and astig-matism < 0.75dt. OS was measured using the direct compensationmethod (van den Berg Straylightmeter) with different ring stimuli(S 3,5◦, M 10◦ and L 28◦). Best corrected HCVA and LCVA were mea-sured using a Bailey- Lovie chart. Afterward on the RE of all patientswere fitted with NesofilconA, and in the LE with HilafilconA lenses.All measurements were repeated after 20 minutes and 8 hours fromthe fitting, and after removal of the lenses.

Results: The mean OS measured without lenses in RE were forS 1.13 ± 0.22log(s), M 1.04 ± 0.15log(s), L 1.04 ± 0.11log(s) and inLE 1.12 ± 0.16 log(s), 1.05 ± 0.17log(s), 1.06 ± 0.18log(s), with nosignificant differences between the eyes (p > 0,05). HCVA was -0.21 ± 0.06logMAR for RE and -0.19 ± 0.12logMAR for LE, and LCVA0.01 ± 0.11logMAR and 0.00 ± 0.12logMar. The OS and HCVA andLCVA measurements done after 20 minutes and after the lenseshave removed were not significant different from the initial results(p > 0.05). After 8 hour of wear the only significant (p < 0.05) dif-ferences compared to measurements done after 20 minutes werefound in LE for S (1.39 ± 0.25 log(s)) and M (1.31 ± 0.21 log(s))stimuli.

Conclusions: Our results showed that after 8 hours of wear onlyHilafilconA lenses increased significantly OS measured with S andM stimuli. Since the OS in both eyes before the fitting, after thelenses have been removed and after 20 minutes of wear were notsignificantly different, the results may indicate different effects oftwo materials. OS measurements with the smaller stimuli seemsmore sensitive than HCVA and LCVA measurements to highlightdifferences in clinical performance of CLs.

http://dx.doi.org/10.1016/j.clae.2013.08.112

50Supplementary reading spectacles duringadaptation period to multifocal contact lensesin presbyopes

H Neves (OD) ∗, D Lopes-Ferreira (MsC), LIsla-Paradelo (MsC), J Jorge (PhD), GonzálezMéijome (PhD)E-mail address: helena neves @hotmail.com(H. Neves).

Purpose: Evaluate the pattern of use of supplementary read-ing spectacles (SRS) in presbyopic patients during the first 15 daysadaptation period to three different multifocal soft contact lens(MSCL).

Method: Nineteen healthy subjects with mean age of 48.6 ± 3.7years participated in a 15 days dispensing, crossover randomisedclinical trial. Each patient wore three different MSCL in randomorder: Air Optix Multifocal(OPT), Acuvue Oasys(OAS) for Presby-opia and Proclear Multifocal(PRO) for 15 days period, each onefollowed by a one week wash-out period. SRS with +1.50 Add powerwere provided to patients to be used at their discretion. The out-come measure was the pattern of use of these spectacles rated as

Poster abstracts / Contact Lens & Anterior Eye 36 (2013) e16–e46 e33

“never”, “rarely”, “frequently” or “very frequently”, after 7 and 15days of lens wear.

Results: Near visual acuity with contact lenses was -0.03 ± 0.15for Acuvue Oasys, -0.06 ± 0.08 for Air Optix and -0.09 ± 0.12 forProclear. Most of the patients reported “never” (OAS:31%; PRO:44%;OPT:56%) or “rarely” (OAS:44%; PRO:28%; OPT:25%) using their SRSat the 7 days visit, with some of them reporting a “very frequent”pattern of use (OAS:13%; PRO:6%; OPT:11%). Comparing 7 to 15 daysvisits there was an increase in patients using SRS with Oasys (13%vs 18% report “very frequent” use and 13% vs 24% report “frequent”use), and a decrease in patients using SRS with Optix (13% vs 6%report “frequent” use). With Proclear, comparing 7 to 15 days visitsthere was an increase in patients reporting “never” using SRS (44%vs 50%).

Conclusions: Supplementary reading spectacles help to allowsome of the newly fitted presbyopes to overcome some of the mostdifficult challenges of the daily activity during the first days of adap-tation and its use is well accepted. At least with some MSCL, it isexpected that the patient becomes more independent of SRS overa period of 15 days.

http://dx.doi.org/10.1016/j.clae.2013.08.113

51Astigmatic peripheral refraction patterns inorthokeratology for different myopictreatments

António Queirós (Ph.D.) ∗, Miguel Faria-Ribeiro(MD), Daniela Lopes-Ferreira (MD), PauloFernandes (Ph.D.), José ManuelGonzález-Méijome (Ph.D.)E-mail address: aqp@fisica.uminho.pt (A. Queirós).

Purpose: The purpose of this study was to evaluate the effect oforthokeratology for different degrees of myopia correction in therelative location of tangential (Ft) and sagittal (Fs) components ofastigmatism.

Method: Thirty-four right eyes of 34 patients with a mean ageof 25.2 ± 6.4 years were fitted with Paragon CRT (Mesa, AZ) rigidgas permeable contact lenses to treat myopia (M = - 2.15 ± 1.26D[-0,88/-5.25D]). Axial and peripheral refraction were measured alongthe central 70◦ of the horizontal visual field with the GrandSeiko WAM5500 open-field auto- refractor.Analysis was strati-fied into 3 different myopic ranges according to the M baselinerefraction as Group 1 [M = -0.50/- 1.50D;n = 11], Group 2 [M = -1.51/-2.49D;n = 11], and Group 3 [M = -2.50/-5.75D;n = 12]. M, J0and J45 components of refraction, as well as FT and FS focal lengthswere obtained.

Results: All patients achieved successful correction (post- treat-ment, M = -0.14 ± 0.61 D). M and J0 components were significantlymore myopic after treatment beyond the central 40◦ of the visualfield (p < 0.001). Regarding the astigmatic foci, FT became signifi-cantly more myopic for all groups in the nasal and temporal visualfields at 25◦ (p≤0.017), 30◦ (p≤0.007) and 35◦ (p≤0.004). Groups2 and 3 showed also a significant myopic increase in FT in at20◦ in the nasal visual field (p≤0.008) and at 10◦ (p≤0.034), 15◦

(p≤0.007) and 20◦ (p≤0.003) in the temporal visual field. Myopicchange in FS was less consistent, achieving only statistical sig-nificance for all groups at 35◦ to both sides of the visual field(p≤0.045). The highly myopic group 3 achieved also significantmyopization of FS at 20◦, 25◦ and 30◦ to both sides of the visual field(p≤0.017).

Conclusions: Orthokeratology changes significantly the tan-gential focal (FT) in the myopic direction beyond the central 40◦

irrespective of the attempted correction. However, FS changes sig-

nificantly in the myopic direction only for the most peripherallocations measured.

http://dx.doi.org/10.1016/j.clae.2013.08.114

52Power profiles of single vision soft contactlenses

Sandra Wagner ∗, Fabian Conrad (PhD), Ravi CBakaraju (BOptom PhD FAAO), Cathleen Fedtke(Dipl.Ing PhD FAAO), Klaus Ehrmann (MEng PhD)E-mail address: 31788@studmail.htw-aalen.de(S. Wagner).

Purpose: The purpose of this investigation was to assemble acatalogue of power profiles of commercially available soft con-tact lenses. The repeatability of the measuring instrument was alsodetermined.

Method: The recently launched SHSOphthalmic instrument(Optocraft GmbH, Erlangen, Germany), based on the Hartmann-Shack principle, was used to measure the power profiles ofcommercially available contact lenses. Repeatability of measure-ment was determined by taking ten independent measurements ofa single lens lotrafilcon A. Six types of spherical single vision softcontact lenses (comfilcon A, filcon II 3, lotrafilcon A, lotrafilcon B,omafilcon A, senofilcon A) of five manufacturers were measured,each in three powers (-1.00D, -3.00D and -6.00D) and five samples.Averaged power profiles were plotted for each lens type and power.

Results: Instrument repeatability was dependent on the dis-tance from the optical centre. Confidence intervals ranged from0.38D for the central 0-0.5 mm to 0.03D at 2.5-3.0 mm ring zones.Manufacturing consistency varied between lens types with com-filcon A lenses exhibiting the biggest variations between the fivesamples (0.62D). Different lens types showed distinct power pro-files, which also was dependent on the lens power. omafilcon Alenses had the most negative spherical aberration, -1.20D at3 mm half chord for -6.00D, followed by comfilcon A, senofilcon A,lotrafilcon B, filcon II 3, with lotrafilcon A having the least -0.17D.The filcon II 3 lenses measured the most minus compared to theirnominal powers and compared to the other lens types. lotrafil-con A lenses showed less minus than labelled (for -6.00D lens at1.5 mm half chord: deviation of 0.49D for filcon II 3 and 0.39D forlotrafilcon A).

Conclusions: With exception of the central 0.5 mm, theSHSOphthalmic instrument measures power profiles with goodrepeatability. Power profiles vary considerably between lens typesand lens powers. Together with the absolute shift in power for somelenses, this variability might influence lens prescription, whichshould be confirmed by over refraction.

http://dx.doi.org/10.1016/j.clae.2013.08.115

53Identikit of a successful contact lenses wearerwith presbyopia

Fabrizio Zeri (PhD, Dip Optom (It), DPsych, FIACLE,FBCLA) ∗, Manuele Di Censi (D.Opt, Optom),Stefano Livi (PhD, DPsych), Paolo Calcatelli (DipOptom (It))E-mail address: zeri@fis.uniroma3.it (F. Zeri).

Purpose: At present, the use of contact lenses (CL) in peoplewith presbyopia is rather limited. The aim of the study was to assessand compare successful and unsuccessful wearers of CL. In particu-lar, the wearers’ personal characteristics (motivation, attitudes andlifestyles) were taken into account.