Cataract Surgery: Femto LDV Z8 Versus Conventional

Study Overview
=================
Brief Summary
-----------------
The aim of the study is to demonstrate the performance and safety of the Femtosecond laser-assisted anterior capsulotomy and lens fragmentation on human eyes using the FEMTO LDV Z8 compared to conventional technique in cataract surgery.

Detailed Description
-----------------
Cataract Surgery according to conventional procedure, with the exception of two steps (Capsulotomy and Lens Fragmentation) which are performed with a Femtosecond Laser in the study group. Used equipment for measurements is the same for both groups and in line with the normal equipment used for the conventional cataract treatment (group A) Cataract surgery will be performed conventionally, this means the capsulorhexis will be performed manually by a hook, and the lens extraction will be done by phacoemulsification. (group B)

Official Title
-----------------
A Single Centre Randomized Eye Study to Compare the Performance and Safety of Femtosecond Laser-assisted Cataract Procedures With Conventional Ultrasound-assisted Cataract Surgery

Conditions
-----------------
Cataract

Intervention / Treatment
-----------------
* Device: Femto LDV Z8
* Device: Manual capsulorhexis&lens fragmentation


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Eligible to undergo cataract extraction by phacoemulsification with primary intraocular lens Implantation Able to co-operate with the docking system for the femtosecond laser Clear corneal media 50 years of age or older Willing and able to return for scheduled follow-up examinations Exclusion Criteria: Minimal and maximal K-values of the central 3mm zone that differ by more than 5D on a keratometric map of the cornea Maximum K-value that exceeds 58D Minimal K-value of less than 37D Corneal disease or pathology, such as corneal scaring or opacity, that precludes transmission of laser wavelength or that distorts laser light Poorly dilating pupil or other defect of the pupil that prevents the iris from adequate retraction peripherally Manifest Glaucoma+OHT (ocular hypertension), pseudoexfoliation Previous intraocular or corneal surgery of any kind, including any type of surgery for either refractive or therapeutic purposes in either eye Known sensitivity to planned concomitant medications History of lens or zonular instability Keratoconus or keratectasia Immune compromised or diagnosis of connective tissue disease, clinically sign. atopic disease, insulin dependent diabetes mellitus, autoimmune diseases, ocular herpes zoster or simplex, endocrine diseases, lupus, RA, collagenosis and other acute or chronic illnesses that increases the risk to the subject or confounds the outcomes of this study, in the opinion of the study PI. Anterior chamber depth (ACD) < 1.5 mm or ACD > 4.8 mm as measured from the corneal endothelium. Extensive corneal scarring Developmental disability or cognitive impairment (would preclude adequate comprehension of the Informed Consent (IC) form and/or the ability to record the study measurements) Concurrent participation in another ophthalmological clinical study

Ages Eligible for Study
-----------------
Minimum Age: 50 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Femto LDV Z8<br>Femtosecond laser-assisted cataract pre-treatment: Capsulotomy and lens fragmentation, followed by ultrasound phacoemulsification | Device: Femto LDV Z8<br>* Femtosecond laser-assisted cataract pre-treatment: Capsulotomy and lens fragmentation, followed by ultrasound phacoemulsification<br>* Other names: Treatment A;|
| Active Comparator: Manual capsulorhexis&lens fragmentation<br>The Conventional group acts as a control group with conventional capsulorhexis and ultrasound phacoemulsification | Device: Manual capsulorhexis&lens fragmentation<br>* Control treatment where the capsulorhexis is performed manually and the lens fragmentation is performed by the stop and chop technique with the phaco emulsification device<br>* Other names: Treatment B;|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Effective Phaco Time (EPT) | Effective Phacoemulsification Time (EPT): EPT for eyes receiving Intervention A being statistically same or lower than EPT for eyes receiving Intervention B at p<0.05 will be considered positive for superior efficacy of application of FEMTO LDV Z8 over the manual procedure Effective Phaco Time is a unit. It is commonly understood in the area of cataract surgery to be the standard way to describe phaco energy during a procedure over different manufactured phaco devices. Effective phaco time is the total phaco time at 100 percent phaco power. It can be less than the total foot-pedal time. Less EPT indicates proportionately less energy delivered to the eye thereby reducing the side effects of phaco power. | day of surgery | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Ease of Phacoemulsification | Ease of phacoemulsification was performed as a subjective observation by the surgeon. Four classifications were possible: easy - phacoemulsification was fast and uncomplicated; 'slight resistance' - phacoemulsification encountered some difficulty; 'resistance noted' - phacoemulsification was somewhat complex; 'difficult' - phacoemulsification was difficult and complex to complete. | during surgery | 
| Number of Participants With Complete Treatment Pattern | Completeness of capsulotomy is a subjective metric given by the surgeon. Measurements were scaled into the following four categories: 1: complete treatment pattern; 2: micro-adhesion; 3: incomplete treatment pattern; 4: complete pattern but not continuous. Complete treatment pattern is considered the best result, micro adhesion indicates a minor but manageable problem, incomplete treatment pattern indicates a treatable, but more complex suboptimal outcome and complete treatment but discontinuous pattern indicates the treatable but suboptimal outcome. | during surgery |