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Eye irritation

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eye irritation: in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
Jan 2015
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference Type:
study report
Report Date:

Materials and methods

Test guideline
according to
OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying i) Chemicals Inducing Serious Eye Damage and ii) Chemicals Not Requiring Classification for Eye Irritation or Serious Eye Damage)
GLP compliance:
yes (incl. certificate)

Test material

Test material form:
liquid: viscous
Specific details on test material used for the study:
- Batch No.of test material: P2D5000133
- Purity: 100 %
- Expiration date of the lot/batch: 2015-06-12

Test animals / tissue source

other: isolated cornea from eyes of slaughtered cattle
Details on test animals or tissues and environmental conditions:
- Source: Slaughterhouse Laame, Buchenhofen 26, 42329 Wuppertal, Germany
- Extraction: Staff of the slaughterhouse
- Transport: 1L containers with 500 mL HSS and 1 % penicillin/streptomycin solution; transport of the containers in coolers on ice

Test system

unchanged (no vehicle)
yes, concurrent positive control
yes, concurrent negative control
Amount / concentration applied:
750 μL per cornea
Duration of treatment / exposure:
10 minutes
Duration of post- treatment incubation (in vitro):
90 minutes
Number of animals or in vitro replicates:
Details on study design:
- PREPARATION OF CORNEAS: Eyes were examined after delivery to the laboratory for any damage (like opacity, scratches or neovascularization) on the day of slaughter (1 day before the experiment). Eyes without any visible defects were transferred into new containers with fresh HSS solution supplemented with 1 % penicillin I streptomycin solution and 1 % FBS and stored overnight at refrigerator temperature (2-8 °C). Eyes with defects were discarded. On the next day (day of experiment) the containers with the eyes were transferred in an incubator at 32 °C (± 1 °C) for about 2 hours. For the preparation of the cornea the sclera of each eye was incised with a scalpel and cut by scissors. A 2-3 mm scleral edge was left around the cornea for further handling. The isolated corneas were placed with the epithelium side down into a prepared beaker filled with MEM medium supplemented with 1 %penicillin I streptomycin solution and 1 % FBS. Each cornea was placed in a cornea holder with the endothelial side on the sealing ring of the posterior chamber. The anterior chamber was then fixed by screws on the other side. The chambers were filled with MEM medium, avoiding air bubbles. The holders so prepared were transferred for at least 1 hour into the incubator at 32 °C (± 1 °C).
- SELECTION OF CORNEAS FOR APPLICATION: Following 1 hour in the incubator, the MEM medium was aspirated and the chambers were refilled with fresh MEM medium. For each cornea the reference opacity value was measured then. The mean and standard deviation of the measured values were calculated by using Microsoft Excel. The corneas with values within the range of mean ± standard deviation were selected for the actual test and assigned to the test groups. The numbers of the corneas selected were documented in an appropriate protocol. The holders were labeled with a new serial number for the further testing.
- APPLICATION OF THE TEST MATERIAL AND INCUBATION: Immediately before application, the medium was aspirated from the anterior chamber. 750 µL of the test material formulations were applied to the corneas, each through the holes of the anterior chamber. The holes of both chambers were sealed with adhesive tape and the holders were kept with the front side up, so that the formulations covered the cornea sufficiently. The holders were transferred into the incubator at 32 °C (± 1 °C) for the exposure time of 10 minutes. After the exposure, the formulations were aspirated from the anterior chamber. The corneas treated with the vehicle control, the negative and the positive control were rinsed at least 3 times with phenol red containing MEM to show effectiveness of test substance removal. The corneas treated with the test item were rinsed at first with com oil and then also at least 3 times with phenol red containing MEM. During the final rinse cycle the corneas were rinsed again with pure MEM medium in order to remove residues of the dye. The anterior chamber was then filled again with MEM medium to avoid drying out of the cornea. Before measuring opacity, fresh MEM medium was filled in the chambers.
- DETERMINATION OF OPACITY: The opacity of a cornea was measured by the diminution of light passing through the cornea. The measurements of opacity were carried out using an opacitometer BASF OP3.0 (with integrated light meter testo 545 and Comfort 3.4 SP6 software from Testo AG, Lenzkirch). Before each measurement the opacitometer was adjusted to about 1000 LUX and a filter calibration measurement was carried out by using 3 different filters.
- DETERMINATION OF PERMEABILITY: The medium in anterior chamber of each holder was replaced by 1 ml of fluorescein sodium solution (concentration 4 mg/mL). Afterwards the holders were incubated at 32 oc (± 1 °C) for about 90 minutes. After the incubation period, the medium of the posterior chamber was aspirated by a syringe and filled into a 10 mL tube. Three wells of a 96 well plate were filled with 300 )lL of each tube (triplicate determination). In addition, a standard series of 4 mg/mL sodium fluorescein solution was prepared and also filled into the 96-well plate, in triplicates. The permeability was determined by measuring the amount of fluorescein sodium which diffused through all cell layers of the cornea. The measurement was carried out at a wavelength of 490 nm (OD490) by an ELISA- Reader (Bio-Tek EL 808, Software Gen5).
- CALCULATION AND EVALUATION OF IN VITRO IRRITANCY SCORE (IVIS): All parameters and the IVIS values were calculated by using Microsoft Excel.
The opacity values were calculated by applying the following formulae:
1) Opacity= (Io/I-0.9894)/0.0251
2) Opacity change = opacity after application - opacity before application
3) Corrected opacity change= opacity change- mean opacity change NC
4) Mean opacity = mean of all corrected opacity changes per group
The permeability values were calculated by applying the following formulae:
1) OD490 change = OD490 value - mean blank value OD490
2) Corrected OD490 change= OD490 change- mean OD490 change NC
3) Mean OD490 = mean of all corrected OD490 changes per group
Calculation of In Vitro Irritancy Score (IVIS):
1) IVIS per cornea = corrected opacity change + (15 x corrected OD490 change)
2) IVIS per group = mean of IVIS values per cornea in a group

Io = single value of the measurement of empty holder with medium but without cornea, measured 1-2 days before the experiment;
I = individual value of each opacity measurement before and after application 0.9894 / 0.0251 is a constant, which is required for calculation.

- DECISION CRITERIA: The IVIS cut-off values for identifying test chemicals as inducing serious eye damage (UN GHS Category 1) and test chemicals not requiring classification for eye irritation or serious eye damage (UN GHS No Category) are given hereafter:
IVIS <= 3 (No category), IVIS > 3 - <= 55 (No prediction can be made / No Category 1) or IVIS > 55 (Category 1)

Results and discussion

In vitro

Irritation parameter:
other: in vitro irritancy score (IVIS)
Run / experiment:
4 hrs
Vehicle controls validity:
not examined
Negative controls validity:
Positive controls validity:

Any other information on results incl. tables

Table 1: Tabular in vitro irritancy scores (IVIS)

   Cornea No. Opacity per cornea  Permeability per cornea IVIS per cornea  IVIS mean  SD

 Negative control (0.9 % NaCl)

 1 2.33 0.010 2.49    
   2 3.18 0.007 3.29 2.32 1.06
   3 1.08 0.008 1.19    

 Positive control (1 % NaOH)

 4 69.12 1.639 93.70    
   5 104.45












 Test item (KGD 1409)


- 5.81


- 5.74





- 3.91 

- 0.003

- 3.96

- 5.03




- 5.37

- 0.001 

- 5.38



No potential for serious eye damage was concluded from the study, as the IVIS was below 55 for the test item.

Applicant's summary and conclusion

Interpretation of results:
other: no severe eye damage
Executive summary:

KGD 1409 was investigated in the Bovine Corneal Opacity and Permeability (BCOP) test according to OECD TG 437. The epithelial surface of the corneas was exposed to 750 µL of the undiluted test substance. Measurement of corneal opacity and permeability after a 10 minutes exposure followed by a post-treatment incubation of 90 minutes revealed an in vitro irritation score (IVIS) of - 5.03, well below the threshold for classification of serious eye damage (IVIS <=55). The positive (1 % NaOH) and negative (saline solution) controls confirmed the validity of the test. Thus, under the conditions of this test KGD 1409 was characterized by having no potential to seriously damage the eye.