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Toxicological information

Eye irritation

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Administrative data

Endpoint:
eye irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 1998-03-04 to 1998-03-11
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1998
Report date:
1998

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)
Version / remarks:
cited as: Directive 92/69/EEC, from 29 Dec 1992
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 405 (Acute Eye Irritation / Corrosion)
Version / remarks:
adopted: 24 Feb 1987
Deviations:
no
GLP compliance:
yes

Test material

Constituent 1
Reference substance name:
-
EC Number:
429-990-6
EC Name:
-
Molecular formula:
Not applicable as multi-const. substance. Please refer to IUCLID section 1.2 for details on constituents.
IUPAC Name:
2-[(2R)-2-(propan-2-yl)-1,3-oxazolidin-3-yl]ethan-1-ol; 2-[(2R)-2-(propan-2-yl)-1,3-oxazolidin-3-yl]ethyl 2-[(2S)-2-(propan-2-yl)-1,3-oxazolidin-3-yl]ethyl carbonate; 2-[(2S)-2-(propan-2-yl)-1,3-oxazolidin-3-yl]ethan-1-ol; bis{2-[(2S)-2-(propan-2-yl)-1,3-oxazolidin-3-yl]ethyl} carbonate; methyl 2-[(2R)-2-(propan-2-yl)-1,3-oxazolidin-3-yl]ethyl carbonate; methyl 2-[(2S)-2-(propan-2-yl)-1,3-oxazolidin-3-yl]ethyl carbonate
Test material form:
liquid: viscous

Test animals / tissue source

Species:
rabbit
Strain:
New Zealand White
Details on test animals or tissues and environmental conditions:
TEST ANIMALS
- Source: Charles River UK Ltd. Margate
- Age at study initiation: 11 to 16 weeks
- Weight at study initiation: 2.54 to 3.38 kg
- Housing: single pen with minimum floor area of 0.6 sq m
- Diet: ad libitum, SQC TRB Rabbit Diet 9603 (pelleted) from Harlan Teklad. Bicester
- Water: tab water, ad libitum
- Acclimation period: two weeks

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 16 to 22 °C.
- Humidity (%): 40 - 80 % RH
- Air changes: 10 air changes per hour
- Photoperiod: 12 hours light from 6:00 a.m. to 6:00 p.m.

Test system

Vehicle:
unchanged (no vehicle)
Controls:
not required
Amount / concentration applied:
TEST MATERIAL
- Amount applied: 0.1 mL
Duration of treatment / exposure:
single treatment
Observation period (in vivo):
1, 24, 48 and 72 hours and up to 4 days after dosing
Number of animals or in vitro replicates:
3 femals
Details on study design:
REMOVAL OF TEST SUBSTANCE
- Washing: the treated eyes were not washed after instillation

SCORING SYSTEM:
Ocular Grading System based on Draize. EEC Ocular Scores (Corneal Opacity, Iris Lesions, Conjunctival Redness, Conjunctival Edema)

TOOL USED TO ASSESS SCORE: fluorescein

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
conjunctivae score
Remarks:
(redness)
Basis:
animal #1
Remarks:
(mean)
Time point:
24/48/72 h
Score:
0
Max. score:
4
Reversibility:
fully reversible
Irritation parameter:
conjunctivae score
Remarks:
(redness)
Basis:
animal #2
Remarks:
(mean)
Time point:
24/48 h
Score:
1
Max. score:
4
Reversibility:
not specified
Remarks on result:
other: no values presented because the rabbit was terminated on Day 2
Irritation parameter:
conjunctivae score
Remarks:
(redness)
Basis:
animal #3
Remarks:
(mean)
Time point:
24/48 h
Score:
2
Max. score:
4
Reversibility:
not specified
Remarks on result:
other: no values presented because the rabbit was terminated on Day 2
Irritation parameter:
chemosis score
Basis:
animal #1
Remarks:
(mean score 1)
Time point:
24/48/72 h
Score:
0
Max. score:
4
Reversibility:
fully reversible
Irritation parameter:
chemosis score
Basis:
animal #2
Remarks:
(mean)
Time point:
24/48 h
Score:
1
Max. score:
4
Reversibility:
not specified
Remarks on result:
other: no values presented because the rabbit was terminated on Day 2
Irritation parameter:
chemosis score
Basis:
animal #3
Remarks:
(mean)
Time point:
24/48 h
Score:
2
Max. score:
4
Reversibility:
not specified
Remarks on result:
other: no values presented because the rabbit was terminated on Day 2
Irritation parameter:
cornea opacity score
Basis:
animal #1
Remarks:
(mean)
Time point:
24/48/72 h
Score:
0
Max. score:
4
Reversibility:
fully reversible
Irritation parameter:
cornea opacity score
Basis:
animal #2
Remarks:
(mean)
Time point:
24/48 h
Score:
2
Max. score:
4
Reversibility:
not specified
Remarks on result:
other: no values presented because the rabbit was terminated on Day 2
Irritation parameter:
cornea opacity score
Basis:
animal #3
Remarks:
(mean)
Time point:
24/48 h
Score:
2
Max. score:
4
Reversibility:
not specified
Remarks on result:
other: no values presented because the rabbit was terminated on Day 2
Irritation parameter:
iris score
Basis:
animal #1
Remarks:
(mean)
Time point:
24/48/72 h
Score:
0
Max. score:
4
Reversibility:
fully reversible
Irritation parameter:
iris score
Basis:
animal #2
Remarks:
(mean)
Time point:
24/48 h
Score:
2
Max. score:
4
Reversibility:
not specified
Remarks on result:
other: no values presented because the rabbit was terminated on Day 2
Irritation parameter:
iris score
Basis:
animal #3
Remarks:
(mean)
Time point:
24/48 h
Score:
2
Max. score:
4
Reversibility:
not specified
Remarks on result:
other: no values presented because the rabbit was terminated on Day 2
Other effects:
With animal 1, there was improvement over the study period and all observations had resolved by 24 hours. Two further rabbits showed marked irritant responses from 4 hours after instillation, including translucent cornea, partial eversion of the eyelids and moderate ocular discharge. At 24 hours these two animals showed no iridial response and they were therefore killed on humane grounds.

Applicant's summary and conclusion

Interpretation of results:
Category 1 (irreversible effects on the eye) based on GHS criteria
Conclusions:
Based on the results of this study, the ocular irritancy of Incozol LV was sufficient for the substance to be classified as Eye Irritant in Cat. 1, according to Regulation (EC) 1272/2008, as amended for the tenth time in Regulation (EC) 2017/776.
Executive summary:

This study was conducted to determine the irritation caused to the rabbit eye following a single instillation of Incozol LV into the conjunctival sac. The method followed was in compliance with Directive 92/69/EEC method B5 and OHCD TG 405. The undiluted test article (0.1 mL) was instilled into one conjunctival sac of each of three New Zealand White rabbits on Day 1. Ocular reactions were assessed for up to four days after treatment.

Instillation of undiluted Incozol LV into one ocular sac of the sentinel rabbit caused a moderate initial sting response. Injection of the conjunctival blood vasculature and inflammation of the iris were apparent immediately after treatment. Although iridial inflammation resolved within one-half hour of treatment, conjunctival irritation reactions persisted for up to 24 hours; injection of the conjunctival blood vasculature, slight chemosis and a slight ocular discharge were apparent one-half hour and one hour after instillation of the test article and a moderate ocular discharge was apparent 4 hours and 24 hours after treatment. The cornea remained overtly unaffected by Incozol LV and was impermeable to applied fluorescein on Day 2. All irritation reactions resolved within 48 hours of instillation of Incozol LV into the non-anaesthetised eye.

The initial sting reaction observed in the sentinel rabbit was sufficiently marked that both rabbits subsequently committed to the study were prepared for treatment by administration of a corneal anaesthetic. Diffuse opacity of the greater part of the cornea and inflammation of the iris and conjunctivae were apparent in both rabbits one-half hour after treatment. The irritant effects of Incozol LV intensified such that four hours after treatment the treated cornea appeared translucent and conjunctival reactions included a crimson red appearance, chemosis sufficient to cause partial aversion of the eyelids and a moderate ocular discharge. Conjunctival irritation reactions included a crimson red appearance, chemosis sufficient to cause partial eversion of the eyelids and a marked ocular discharge. The iridial reflex of both rabbits (meiosis in response to bright incident light) was found to be absent. The loss of the iridial reaction necessitated immediate termination of the study. Both rabbits were killed on humane grounds.

Irritant effects of Incozol LV in the anaesthetised eye included translucency of the cornea, disruption of the corneal epithelium, marked conjunctivitis and loss of the iridial reflex. Although it is accepted that use of anaesthetic appears to have exacerbated the irritant effects of the test article by impairing the normal clearance mechanisms provided by the tearing mechanism and the nictitating membrane, it has been concluded that Incozol LV is severely irritating to the eye.

Based on the results of this study, the ocular irritancy of Incozol LV was sufficient for the substance to be classified as Eye Irritant in Cat. 1, according to Regulation (EC) 1272/2008, as amended for the tenth time in Regulation (EC) 2017/776.