Multifocal and pattern-reversal visual evoked potentials vs. automated perimetry frequency-doubling technology matrix in optic neuritis.

BACKGROUND: To compare the usefulness of the traditional pattern-reversal Visual Evoked Potentials (VEP) with multifocal VEP (mfVEP) and Frequency-Doubling Technology (FDT) perimetry in the evaluation of the ocular abnormalities induced by acute or subacute optic neuritis (ON). MATERIALS AND METHODS: The test results of 24 ON patients were compared with those obtained in 40 normal control subjects. MfVEP recordings were obtained by using an Optoelectronic Stimulator that extracts topographic VEP using a pseudorandom m-sequence stimulus. Receiver operator characteristic (ROC) curves were calculated to determine the sensitivity and specificity of abnormal values. RESULTS: The frequency of the abnormal ocular findings differed in the ON patients according to the used technique. Reduced visual sensitivity was demonstrated in 12 eyes (54.5%) using FDT perimetry; 17 eyes (77.2%) showed decreased amplitude and/or an increase in the implicit time of the P1 wave in mfVEP and 20 eyes (90.9%) showed an abnormal decrease in the amplitude and/or an increase in the latency of the P100 peak at VEP examination. The areas under the ROC curves ranged from 0.743 to 0.935, with VEP having the largest areas. The VEP and mfVEP amplitudes and latencies yielded the greatest sensitivity and specificity. CONCLUSIONS: The mfVEP and the FDT perimetry can be used for the evaluation and monitoring of visual impairment in patients with ON. The most sensitive and practical diagnostic tool in patients with ON is, however, the traditional VEP. The mfVEP can be utilized in those cases with doubtful or negative VEP results.

Ibopamine: D1-dopaminergic agonist in the diagnosis of glaucoma.

PURPOSE: The purpose of the study was to assess the effect of ibopamine (3,4 di-isobutyrrylester of N-methyldopamine), a D1-dopamine agonist, on intraocular pressure (IOP) in offspring of parents with primary openangle glaucoma as a consequence of outflow structures impairment. MATERIALS AND METHODS: We included participants aged between 8 and 40 years: group 1, 163 offspring of at least 1 parent with primary openangle glaucoma with normal IOP and without glaucomatous damages; group 2, 108 offspring of healthy parents (without history or existing glaucoma). Ibopamine test was performed by instilling 2 drops, 5 minutes apart, in both eyes followed by repeated IOP measurements over a 45-minute period. The test is considered positive if there is an IOP increase of ≥3 mm Hg 45 minutes after instillation. RESULTS: Baseline IOP before the test was 15.73±2.31 and 15.31±1.86 mm Hg in groups 1 and 2, respectively. Test was positive in 44.33% of cases in group 1 with a mean increase in IOP of 5.57 mm Hg (P<0.001), whereas in all participants of group 2 the test was negative with even 1 to 2 mm Hg IOP reduction. CONCLUSIONS: D1-dopaminergic stimulation due to ibopamine increases IOP as a result of increased production of the aqueous humor in participants with an impaired outflow. The study showed that offspring of at least 1 parent with primary openangle glaucoma--offspring without glaucomatous damages--show an increase of IOP after ibopamine administration, which signifies an impaired function of outflow structures and, therefore, a predisposition to intraocular hypertension and possible glaucoma.

Differential activity and clinical utility of latanoprost in glaucoma and ocular hypertension.

BACKGROUND: The purpose of this study was to demonstrate the hypotensive efficacy and tolerability of latanoprost when used as monotherapy and as polytherapy associated with antiglaucomatous medication proven to be ineffective in keeping intraocular pressure under control. METHODS: Three hundred and thirty-seven patients (672 eyes) affected by primary open-angle glaucoma and intraocular hypertension were recruited over a period of 10 years from the Glaucoma Centre, Department of Ophthalmological Sciences, University of Rome "Sapienza", and treated, subject to informed consent, with latanoprost 0.005% alone or in combination with other ocular hypotensive drugs. The patients were followed during this period at regular intervals, with determination of visual field, fundus oculi, visual acuity, and eventual onset of local and systemic side effects. RESULTS: Latanoprost used as monotherapy and as polytherapy renders possible optimal and durable control of intraocular pressure in the form of one antiglaucomatous drug because it can substitute for one or more drugs and obtain the same hypotensive effect. CONCLUSION: Latanoprost can be described as the ideal hypotensive drug, not only because of its ideal compliance profile (only one daily dose in the evening), excellent hypotensive effect, and, above all, few systemic side effects.

Multifocal and pattern-reversal visual evoked potentials vs. automated perimetry frequency-doubling technology matrix in optic neuritis.

Background: To compare the usefulness of the traditional pattern-reversal Visual Evoked Potentials (VEP) with multifocal VEP (mfVEP) and Frequency-Doubling Technology (FDT) perimetry in the evaluation of the ocular abnormalities induced by acute or subacute optic neuritis (ON). Materials and Methods: The test results of 24 ON patients were compared with those obtained in 40 normal control subjects. MfVEP recordings were obtained by using an Optoelectronic Stimulator that extracts topographic VEP using a pseudorandom m-sequence stimulus. Receiver operator characteristic (ROC) curves were calculated to determine the sensitivity and specificity of abnormal values. Results: The frequency of the abnormal ocular findings differed in the ON patients according to the used technique. Reduced visual sensitivity was demonstrated in 12 eyes (54.5%) using FDT perimetry; 17 eyes (77.2%) showed decreased amplitude and/or an increase in the implicit time of the P1 wave in mfVEP and 20 eyes (90.9%) showed an abnormal decrease in the amplitude and/or an increase in the latency of the P100 peak at VEP examination. The areas under the ROC curves ranged from 0.743 to 0.935, with VEP having the largest areas. The VEP and mfVEP amplitudes and latencies yielded the greatest sensitivity and specificity. Conclusions: The mfVEP and the FDT perimetry can be used for the evaluation and monitoring of visual impairment in patients with ON. The most sensitive and practical diagnostic tool in patients with ON is, however, the traditional VEP. The mfVEP can be utilized in those cases with doubtful or negative VEP results.