Lens thickness in atopic cataract: case-control study.

Purpose: To examine whether atopic cataracts are associated with thinner lenses.

Setting: Department of Ophthalmology, Jikei University Hospital, Tokyo, Japan.

Design: Retrospective matched case-control study.

Free radical production by femtosecond laser lens irradiation in porcine eyes.

Purpose: To investigate the relationship between the generation of free radicals and femtosecond laser lens irradiation.

Setting: AMO Laboratory, Tokyo, Japan.

Design: Ex vivo studies.

Influence of irrigation dynamic pressure-assisted hydrodissection on intraocular pressure and the posterior chamber-anterior hyaloid membrane barrier during cataract surgery.

Purpose: To evaluate the effects of irrigation dynamic pressure-assisted hydrodissection (irrigation-hydro: iH) on intraocular pressure (IOP) and the posterior chamber-anterior hyaloid membrane (PC-AHM) barrier in porcine eyes.

Study Design: Experimental.

Methods: In Experiment 1, IOP was recorded while irrigating the anterior chamber (AC), during iH, and during phacoemulsification and aspiration in 20 porcine eyes using bottle heights of 50, 70, and 90 cm.

The safety and efficacy of phaco-sleeve irrigation-assisted hydrodissection during femtosecond laser-assisted cataract surgery.

Femtosecond laser-assisted cataract surgery (FLACS) changes the intraoperative environment due to the generation of intracapsular gas that induces a high intracapsular volume. Manual hydrodissection (mH) may induce high intracapsular pressure (ICP) and additional intracapsular volume, thereby leading to capsular block syndrome (CBS). Since the phaco-sleeve irrigation-assisted hydrodissection (iH) technique is used to initially groove and split the lens and remove the intracapsular gas, this can reduce the intracapsular volume while bypassing the intracapsular lens prior to the hydrodissection.

Irrigation dynamic pressure-assisted hydrodissection during cataract surgery.

The irrigation dynamic pressure-assisted hydrodissection technique (irrigation-hydro [iH]) does not require performing manual hydrodissection using a syringe and cannula to achieve cortical-capsular cleavage during cataract surgery. Since the iH technique uses the phaco tip to intentionally vacuum the intraocular fluid in order to induce the irrigation dynamic pressure for cortical-capsular cleavage, there is a reduction in the intraocular pressure (IOP) from the bottle-height-dependent hydrostatic pressure. Thus, since the peak irrigation pressure derived from the phaco tip sleeve will be limited by the height of the irrigation fluid bottle, this is advantageous in helping to avoid excessively high IOP during cortical-capsular hydrodissection.

Use of the phaco tip technique for lens cleavage and removal during cataract surgery.

Use of the phaco tip technique for lens cleavage and removal does not require manual hydrodissection using a syringe and cannula, or cortical removal using an irrigation/aspiration tip. The phaco tip is the only surgical instrument required for this technique. Its advantages include maintaining a stable intraocular pressure during cortical cleaving hydrodissection and lens removal, which includes the cortex.

Temperature in the anterior chamber during phacoemulsification.

Purpose: To evaluate changes in the aqueous humor temperature using 2 phacoemulsification units (Stellaris 28.5 kHz device and Whitestar Signature 40 kHz device).

Setting: Nippon Medical School, Musashikosugi Hospital, Kawasaki City, Kanagawa, Japan.

Development of a short version of the visual function questionnaire using item-response theory.

Purpose: In clinical ophthalmology as in other fields, measuring patient-reported outcomes imposes a burden on patients. To decrease that burden, we used item-response theory (IRT) to develop and test a short version of the National Eye Institute's Visual Function Questionnaire (VFQ).

Methods: We analyzed VFQ data from 276 adults in Japan.

Effect of bottle height on the corneal endothelium during phacoemulsification.

Purpose: To directly measure intraocular pressure (IOP) in simulated phacoemulsification and to assess the usefulness of lowering the bottle height in protecting the corneal endothelium in clinical phacoemulsification.

Setting: Nippon Medical School Hospital, Tokyo, Japan.

Methods: Simulated phacoemulsification was performed in porcine eyes with 2 bottle heights, 65.

Functional evaluation of corneal endothelium by combined measurement of corneal volume alteration and cell density after phacoemulsification.

Purpose: To assess a new method of functional evaluation of corneal endothelium using combined measurement of corneal volume alteration and cell density (CD) after phacoemulsification.

Setting: Nippon Medical School Hospital, Tokyo, Japan.

Methods: Phacoemulsification was performed in 28 cases.

Incidence of endophthalmitis after cataract surgery in Japan.

Purpose: To estimate the incidence rate of endophthalmitis after cataract surgery performed by Japanese surgeons.

Methods: A sample of 20% of members of the Japanese Society of Ophthalmic Surgeons was randomly selected. Each member was sent a postal survey asking for information on the number of cataract surgeries performed in 2003 and the number of postsurgery cases of endophthalmitis.

Psychometric properties of the 25-item National Eye Institute Visual Function Questionnaire (NEI VFQ-25), Japanese version.

Background: The importance of evaluating the outcomes of health care from the standpoint of the patient is now widely recognized. The purpose of this study is to develop and test a Japanese version of the National Eye Institute Visual Function Questionnaire (NEI VFQ-25).

Methods: A Japanese version was developed with a previously standardized method.

Measuring rectilinear flow within the anterior chamber in phacoemulsification procedures.

Purpose: To measure and photograph rectilinear flow generated in an anterior chamber model during different power phases of phacoemulsification.

Setting: Oki Eye Surgery Center, Tokyo, Japan.

Methods: An ultrasound (US) needle was fitted to a Sovereign WhiteStar (AMO) phacoemulsification unit.

Corneal thickness measurements: scanning-slit corneal topography and noncontact specular microscopy versus ultrasonic pachymetry.

Purpose: To compare central corneal thickness measurements taken with 3 pachymetry systems: Orbscan scanning-slit corneal topography/pachymetry, Topcon SP2000P noncontact specular microscopy, and Tomey ultrasonic pachymetry.

Setting: Multicenter study, Tokyo, Japan.

Methods: In 216 healthy eyes of 114 subjects, scanning-slit topography, noncontact specular microscopy, and ultrasonic pachymetry were used in that sequence to record central corneal thickness.